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The Sisters of St. Joseph for the Diocese of Pembroke in Canada was first incorporated by letters patent dated January 21, 1922 under the Ontario Companies Act. The town of Pembroke, Ontario is located on the traditional lands of the Algonquin and Anishinaabe Peoples.

In 1910, Sisters from Peterborough began teaching at St. Michael’s Parish school in Douglas, followed by Killaloe in 1915 and Mount St. Patrick in 1916, all three being small rural communities in Ontario. Eleven years later, on August 25, 1921, a new community was formed at Bishop Ryan’s request by 27 Sisters from Peterborough. 14 of these Sisters were already serving in Douglas, Killaloe, and Mount St. Patrick. Mother Vincent Carroll was elected General Superior.

The new community needed a motherhouse, and the O’Kelly farm was purchased by Bishop Ryan, giving the Sisters 40 acres of farmland and 107 acres of woods on the Ottawa River, along with an old farmhouse. On September 19, 1921 St. Joseph’s-on-the-Lake, the first Motherhouse, was officially opened and blessed by Father Dowdall. St. Joseph’s Convent, the first mission of the newly formed congregation, was established in Chapeau on August 27, 1921. Here the Sisters taught in the local school for many years. The Pembroke Sisters spread out throughout Ontario and Quebec, and even made their way westward to Saskatchewan and Alberta. Some other missions included Calabogie (1924), Campbell’s Bay (1925), Barry’s Bay (1928), Renfrew (1928), Sheenboro (1936), Madawaska (1936), Deep River (1948), Quyon (1951), Des Joachims (1958), Whitney (1958). Bancroft (1959), Ottawa (1962), and Petawawa (1962).

The General Superiors of the Congregation were elected from the ranks of the founding Sisters until 1945 when Mother Magdalen Donegan was elected. She had entered the Congregation in September 1923. At the peak of its membership growth, the Congregation numbered approximately 190.

After three decades, on September 15, 1952, Bishop Smith took part in the sod turning for a new Motherhouse. On April 26, 1953 he blessed the cornerstone. The new motherhouse officially opened on December 12, 1953 – providing a home for years to which Sisters could return from missions outside Pembroke. Many of the convents outside Pembroke housed teachers, as education was a significant ministry. The first classes held at St. Joseph’s Academy, a girls’ high school in Renfrew, on September 10, 1928. A new building was completed in 1940 and the school stayed open for almost three more decades. In October 1940, the Normal School, later St. Mary’s Teachers’ College, opened in Chapeau, and saw its last graduates in 1969. This ministry was unique to the Pembroke Sisters, as no other of our communities provided teacher training.

Following the original thread of the Sisters in Le Puy, the Pembroke Sisters served others in corporal works of mercy through healthcare. On July 25, 1946 Sisters arrived in Radville, Saskatchewan to establish the first hospital, which they administered until 1998. Ten years after opening the hospital, they founded Marian Home to provide long term care, and senior care. Sisters also went to Regina, where they opened Santa Maria Senior Citizens’ Home on October 12, 1968. On January 7, 1947 they assumed the administration and staffing of St. Joseph’s Hospital in Barrhead, Alberta from the Religious Hospitallers of St Joseph. This ministry lasted until 1978.

Closer to home, St. Francis Memorial Hospital in Barry’s Bay, Ontario was opened on October 25, 1960. This hospital was also staffed by the Sisters. Sr. Rosenda Brady, who administered this hospital, later took charge of Valley Manor, a senior’s home in Barry’s Bay, which opened on June 23, 1978. On August 24, 1968, Sisters arrived to administer and staff St. Joseph’s Manor, a home for senior citizens, in Campbell’s Bay, Québec, where they remained until 1982.

There was only a short-lived ministry of orphan care at Villa St. Joseph in Renfrew from 1940 to 1947. In a spirit of adventure, the Sisters set sail to South America on April 17, 1964, to found St. Joseph’s Convent in Chincha Alta, Peru. On the feast day of St. Martin de Porres, November 2, 1964, they opened Clinica San Martin. In the spring of the following year, on April 1, 1965, the parish school opened in Chincha Alta. Classes began at Colegio San Jose in March 1970. On January 1, 1966 Clinica Tom Dooley opened in Chincha Baja.

Still following the thread of the Sisters in Le Puy, the Pembroke Sisters served others in spiritual works of mercy through parish work and spiritual development ministry. On August 15, 1978, Sisters began parish ministry in Penticton (to 1984). In September 1969, St. Joseph Centre, a renewal centre in Chapeau, opened for a brief period, followed in July 1989 by Stillpoint House of Prayer in Springtown, which has seen decades of service.

On November 22, 2012, the congregation amalgamated with those in Hamilton, London, and Peterborough into one charitable corporation under the name Congregation of the Sisters of St. Joseph in Canada by the Congregation of the Sisters of St. Joseph in Canada Act, a Private Act of the Legislative Assembly of Ontario which received Royal Assent on June 13, 2013.

The Sisters of St. Joseph of the Diocese of Peterborough was incorporated on May 1, 1893 under chapter 172 of the Revised Statutes of Ontario, 1887. Peterborough, Ontario is located on the traditional territory of the Mississauga Anishinaabeg Peoples.

In 1890, the Peterborough diocese stretched from the shores of Lake Ontario northward, and westward beyond the western end of Lake Superior by a hundred miles or more. Bishop R.A. O’Connor, Bishop of Peterborough, felt a need for a diocesan congregation which would devote its energies to the educational and health needs of his huge diocese. He discussed the matter with the Sisters of St. Joseph of Toronto, with the result that, in 1890, 20 sisters of the Toronto congregation formed a new congregation in the diocese of Peterborough. Mother Austin Doran was elected General Superior.

The task facing the new congregation was monumental. It had been arranged that they would assume the Academy, a high school for girls in Lindsay, Ontario, and staff the newly opened St. Joseph’s Hospital in Peterborough, Ontario, as well as the existing houses in Cobourg, Ontario and at the head of Lake Superior. To further complicate the task, the new hospital was to care not only for the sick, but also for 40 of Peterborough’s elderly poor who were at the time residents of the House of Providence in Toronto.

Fifteen new members joined the congregation during the first year, and the foundation prospered, although poverty weighed heavily. With growing numbers, a new residence on the outskirts of Peterborough, Mount St. Joseph, was opened in 1895. In the same year, the new congregation began its teaching apostolate in the city of Peterborough. A House of Providence was established in 1900 to accommodate not only the elderly poor, but orphans of the diocese.

The growing congregation led to the formation of two daughter congregations. In 1921, the 27 sisters in three mission houses located in the diocese of Pembroke were, at the request of Bishop Ryan, formed into a new congregation with the Motherhouse in Pembroke. In 1936, the bishop of Sault Ste. Marie announced the formation of a new congregation for his diocese, and thus 120 Peterborough sisters became founding members of the new congregation.

Through the years, the Sisters have served, primarily in education and health care, in the provinces of Ontario, Quebec, Newfoundland, Saskatchewan, Alberta, British Columbia, Manitoba, and in the Northwest Territories and the Yukon. They have also served abroad in Brazil, Honduras, Zambia, Mozambique, Tanzania and the Far East.

Mount St. Joseph, the building that served as the Motherhouse since 1895, had become much more than the Sisters currently needed. After prayerful discernment and careful planning, a new Motherhouse, built to the latest environmental standards, was opened in 2009 beside the historic former Motherhouse, which has been repurposed to serve the Peterborough community.

In spite of decreasing numbers, the closing of convents and the handing over of well-established institutions, the Sisters continue to serve in areas throughout Canada. In their response to changing times and their charism of reaching out to those in need, new ministries call the Sisters forth: they network with other groups who share their mission to the most needy, and offer congregational support to some of the most urgent needs of our society, including adequate shelter for the aged, the homeless, women in need and refugees. They are present on boards that struggle to provide adequate housing for the poor, and volunteer in parishes, health care facilities and organizations that respond to current needs. Fostering spiritual growth is the work of two houses in Ontario: St. Joseph’s Villa in Cobourg and the Upper Room Home of Prayer in Ottawa. Sisters are dedicated to raising awareness about ecology and earth literacy. In this time of transition, The Sisters endeavour to be faithful to the same charism that called the first Sisters to risk all for the sake of love.

On November 22, 2012, the congregation amalgamated with those in Hamilton, London, and Pembroke into one charitable corporation under the name Congregation of the Sisters of St. Joseph in Canada by the Congregation of the Sisters of St. Joseph in Canada Act, a Private Act of the Legislative Assembly of Ontario which received Royal Assent on June 13, 2013.

Josephine Hildegarde Coughlin was born in Mount Camel, Ontario on December 30, 1887 to Bartholomew Coughlin and Johanna Curtin. One of her sisters, Nora (1884-1957), also joined the Sisters of St. Joseph of London and took on the religious name Sister St. Francis. Josephine entered the congregation and received her habit on June 24, 1909. She was given the religious name Sister Margaret and professed her vows on September 16, 1911, in the Chapel of St. Anne at Mount St. Joseph, London, Ontario. After completing senior high school, she attended Ottawa Normal School and graduated in 1913. She then taught in St. Thomas, London, and Woodstock and was appointed the community’s Supervisor of Schools, a position she held for 11 years. In 1945, Sister Margaret transferred to St. Patrick’s High School in Sarnia where she took charge of building an expansion of the original school.

In 1947 she was elected as General Superior. During Mother Margaret’s term as General Superior a great many projects were initiated. Among them were St. Joseph’s House of Studies, which opened for Sisters in studies at London’s University of Western Ontario; property at 353 and 534 Queens Avenue was purchased as a residence for Sisters; Sisters were missioned to housekeeping duties at the Holy Family Retreat House which the Diocese opened in Oxley, on Lake Erie; St. Mary’s Hospital building project was completed and opened in 1951; Catholic Central High School was opened and a private school at Sacred Heart Convent began; a summer home was purchased in Kingsville for the Sisters; a new mission for Sisters in Yellowknife, NT was established; Holy Rosary Convent in Windsor was purchased to replace the overcrowded Cadillac Street convent; two Sisters went to Ireland to seek new candidates; an aspirancy was opened to train young women interested in becoming Sisters; St. Joseph’s House of Studies was opened in Windsor; new Constitutions were approved and sod was turned for a new Motherhouse at Mount St. Joseph.

Under Mother Margaret Coughlin, the “Ireland project” was initiated and Sisters were sent to Ireland in the hopes of recruiting young women interested in joining the congregation. The Superiors’ Institute was initiated in 1958 along with a tertianship program for Sisters, and held at Holy Rosary Convent in the summer with Rev. Embser, C. S. B, assisted by Sister Mary Angela Flaherty. In 1950, Mother Margaret and Sister Placidia Walsh went on a Holy Year pilgrimage to Rome, Italy, and visited the Sisters of St. Joseph in Le Puy and Lyon, France, to celebrate the Sisters of St. Joseph’s tercentenary. During her trip to Rome, she consulted with Monsignor Elio Gambari concerning papal approbation of the congregation’s rule, and as a result the Constitutions received Pontifical Approbation on July 11, 1953.

Mother Margaret Coughlin was deeply involved in the designing of the chapel of the new Mount St. Joseph Motherhouse. It was she who insisted the windows from the old chapel should be incorporated into the new one. In designing the Chapel, her love of the Eucharist shone through as she worked with the architect and artisans to produce a masterpiece of artistry from the wrought iron grill, the pews and sanctuary furnishings which all bore hand-carved grapes and wheat design, symbolic of the Eucharist. The formal opening of the new Mount St. Joseph Motherhouse on June 20, 1954, presented to the people of London a building with heraldic towers and a beautiful chapel with stained glass windows personally chosen by her in consultation with the artist, Guido Polloni, of Florence, Italy.

The Superiors’ Institute was initiated in 1958 along with a tertianship program for Sisters, held at Holy Rosary Convent in the summer with Rev. Embser, C.S.B., assisted by Sister Mary Angela Flaherty. When Sister Julia Moore was elected General Superior in 1962, Mother Margaret remained as an elected Council member. She encouraged the opening of the first foreign mission in Cayalti, Chiclayo Diocese in Peru. A new regional house, St. Joseph’s Convent, was opened in Edmonton, AB. She helped to plan for Ignatia Hall - a home for the senior Sisters and the sick, which was completed in 1969. It was she who suggested that Ignatia Hall be so named since Mother Ignatia must not be forgotten. Mother Margaret died on December 2, 1980.

Anastasia Dentinger was born in St. Agatha, Ontario on September 12, 1888. She was the daughter of Anthony Dentinger (born St. Agatha, Ontario, died 1933) and Mary Dietrich (born Waterloo, Ontario, died 1933). Her siblings were: Mary (Schwartz, 1876-1965); Eugene (1877-1962); William (born 1879) and Clara (Diethelm, born 1882), both of Saskatchewan; Carolyn (Busch, 1884-1966); Simon (1886-1963); Clemens (born 1890) of Saskatchewan; Joseph (born 1893), St. Agatha, ON; Anthony (1896-1961); and Mary (Steffler, 1899-1929).
Anastasia entered the Sisters of St. Joseph of London, received the habit on October 28, 1912, at Mount St. Joseph and was given the name Sister M. St. Stephen. Sister professed first vows on January 4, 1915, and final vows on August 15, 1918, in Sacred Heart Convent Chapel, London.
Sister St. Stephen was a graduate nurse who served in the Community hospitals in London, Chatham, and Sarnia. At Sarnia’s St. Joseph’s Hospital, she was on the nursing staff since its opening in 1946. While stationed in Sarnia she was known for being kind and thoughtful to all, patients, staff, and Sisters.
Her religious life was interwoven with her nursing career. In deep faith she prayed especially to St. Joseph to help with everything necessary for her patients and all those with whom she came in contact. She was well known in the hospital but what made her special was her deep interest and genuine concern for each member of the staff and all patients and visitors. Sister oversaw central supply at St. Joseph’s, but she was always concerned about the well-being of patients and the Sisters. She was an avid reader, most generous with her time and a friend to all.
Sister St. Stephen was instrumental in changing the way alcoholics were treated at St. Joseph’s Hospital in Chatham and later in Sarnia. Instead of the small dark rooms with bars on the doors which were standard at the time, she took the locks off all the doors, furnished the rooms, and endeavoured to treat alike, with love and respect. Sister St. Stephen recognized the extraordinary ability of Sister St. Patrick Joyce who was in training at the time. Later Sister St. Patrick began a ministry to alcoholics and addicts in Sarnia and then in London where she opened a detoxification centre and a house for recovering alcoholics which she named St. Stephen’s house in honour of her association in Sarnia with Sister St. Stephen’s ministry.
Sister St. Stephen suffered a stroke at St. Joseph’s Hospital, Sarnia and died on March 19, 1967. Her body remained there for a day so that the great number of Sarnia residents who wished to pay their respects could express their gratitude for her life. She was then transferred to London, and her Funeral Mass was held in Immaculate Conception Chapel, Mount St. Joseph, London, Ontario.

Sister Mary Diesbourg is a Sister of St. Joseph in Canada who joined the London Congregation.

Adelaide Teresa Dunn was born the youngest daughter of William Dunn and Bridgid O’Boyle in Toronto, Ontario in 1877. Her sister Mary Ellen became a member of the Sisters of St. Joseph of Toronto and was given the religious name Sister Norberta. Adelaide entered the congregation and was received into the community on August 21, 1906, at Mount St. Joseph and was given the religious name, Sister Constance. On August 28, 1908, she professed her vows in the Chapel of St. Anne at Mount St. Joseph, London, received her habit at the Sisters of St. Joseph of London August 21, 1906, and was given the religious name Sister Constance. She professed her vows on August 28, 1908.

Sister Constance was trained as a teacher and received several degrees before she entered the Community. After becoming a member of the London community, she taught in various schools in London Diocese. She was also named Superior in the convents where she lived, in Seaforth, Sarnia and Windsor and at Sacred Heart Convent in London in 1947. From 1935 until 1947 Sister Constance served as the community’s sixth General Superior. During her term of office Sister Constance opened missions in Delhi, Simcoe, Tillsonburg and Langton. She encouraged the formation of the School of Christ radio broadcast from the Chapel of Sacred Heart Convent in 1939 in London which was initiated by Rev. W. Flannery of the London Diocese. After her term as General Superior she was named Superior at Mount St. Joseph Orphanage. She died at St. Joseph’s Hospital in London on June 16, 1956.

Irene Josephine Fallon was born in London, Ontario on August 2, 1917. She entered the Sisters of St. Joseph of London on January 16, 1937, and made profession August 25, 1937. She received the religious name of Sister Rosary and professed her first vows on August 25, 1939, and her final vows on August 25, 1942. Sister Rosary died April 17, 2015, in London, Ontario and is buried in St. Peter's Cemetery, London, Ontario.

Irene Josephine was the daughter of Charles Joseph Fallon and Elle Phelan. Her siblings were Edith, Francis, Wilfred and Jack. She grew up on the family farm near Ballymote, northeast of London, Ontario. At 13 years of age, Irene joined her brothers in the Fallon Family Orchestra, performing throughout southwestern Ontario.
Sister Rosary attended London Normal School from 1941-1942, followed by the University of Western Ontario from 1943-1944. She received numerous certificates from the Government of Ontario in music education, primary methods, music supervision, art, language arts and religious education.

Sister Rosary taught in London from 1942-1943, and then in Sarnia from 1943-1956. She then moved to Woodstock to teach from 1956-1958, returning to Sarnia in 1958 and teaching there until 1961. After this, she taught again in Woodstock from 1961-1966, and then in Windsor from 1966-1968. After spending a year in Maidstone, she taught in Tillsonburg for four years and then served as the school librarian at the high school in St. Thomas for a year. She then returned to Sarnia to teach and do remedial work with students from 1975-1979. At the end of her long teaching career, she spent from 1979-1981 in Kelowna, British Columbia teaching religion in the Holy Spirit Parish and then did parish work in Seaforth until 1982. She enjoyed her year at the Galilee Community Renewal Program in Arnprior from 1989-1990. Sister Rosary was an active volunteer at Riverview Hospital in Windsor, St. Mary's Hospital in London, and playing at Mass at Ignatia Hall, Elginfield and Mount St. Joseph. She played piano for weekly sing-a-longs at the new Motherhouse on Windermere Road. Besides being a gifted musician, Sister Rosary was a talented artist who painted more than 200 paintings. She was also a keen historian, and published her autobiography "Stay on the Melody" in her later years. Sister Rosary will be remembered for her wit, her irrepressible sense of humour, her dedication to the truth, her musical skills, and her sharp memory.

Born Mary Margaret Ferris in London in 1931, Sister Margaret Ferris is a member of the Congregation of the Sisters of St. Joseph of London, who spent much of her life furthering her education and ministry. In particular, she was a reformer and innovator of prayer, community involvement, and spiritual direction at the Congregation. She also published a book titled Compassioning: Basic Counselling Skills for Christian Caregivers in 1993, and various articles pertaining to spiritual direction and community living and involvement.

Sister Margaret Ferris was involved in her local parish at an early age and was especially encouraged in her faith by her grandmother, who lived with the Ferris family. At a young age she began to consider entering religious life. She completed upper school at St. Angela’s College in 1950 and was a member of the first class to ever graduate from Catholic Central High School in 1951. At age 22, after working as a legal secretary, she joined the Congregation of the Sisters of St. Joseph. After the completion of her novitiate, she attended the University of Western Ontario where she completed her Bachelor of Arts degree in 1959, and Master’s degree in Education in 1977. In 1959, she began her teaching career as a high school teacher.

She continued to advance in her career in the 1960s. She became vice-principal of St. Patrick’s High School in Sarnia in 1963, and then principal of Mount St. Joseph Academy in 1966. During the 1960s, she continued to further her own education. She studied during the summer months at the University of Notre Dame. There she received a Master’s degree in Science in 1968. She also became a leader of spiritual renewal at the Congregation, which resulted in a strengthening of her own prayer life.

In 1972, she resigned as principal of Mount St. Joseph Academy, and with three other Sisters, established Internos, a home for troubled teenage girls, who experienced family difficulties or substance abuse. Her ministry evolved as she became exposed to and involved in family and community life. In 1977, she became Director of the Congregation’s Medaille Retreat House. During this time, she was also completing her Master’s degree in Counselling at the University of Western Ontario part-time. During this time, she continued to broaden her experience and understanding of spiritual direction and contemplative spirituality.

In 1978, she was elected to the Congregation’s General Council while still maintaining her position at the Retreat House where she worked alongside individuals of other Christian denominations. In 1984, she studied for a year at the Institute for Creation-Centred Spirituality in California where she obtained a Master’s degree in Spirituality and Culture. She marks this as the richest experience of community in her life, which strengthened and broadened her own spiritual understanding and life.

When she returned to London in 1985, she was asked to join St. Peter’s Seminary as a faculty member in the positions of teacher, counsellor, and Formation Director for Lay Ministry. She was the first woman professor to work full-time at St. Peter’s Seminary. This was another fulfilling experience for Sister Margaret Ferris as she was able to influence the development of the Church and to empower the laity. She held this position for over ten years. In 1992 she obtained her Doctor of Ministry in Spiritual Direction at the Graduate Theological Foundation, and in 2007 she received an honorary Doctor of Divinity Degree from the same institution.

Sister Margaret Ferris also dedicated a portion of her life to travelling. From 1959-1963, she made various trips around Ontario and northern U.S.A. In 1981, she travelled to Peru and Florida. In 1990, she and other Sisters visited Rome where she also met Pope John Paul II and received a rosary from him. In 2003, she made a pilgrimage to Le Puy, France, from where the Sisters of St. Joseph originally came. In 2004, she was honoured as one of the seven Golden Jubilarians in the Congregation. She died in 2017.

Marjorie Teresa Fitzpatrick was born at home on Allumette Island, Quebec on October 14, 1929, to Victor John Fitzpatrick and Margaret Elizabeth Hynes. She was the second eldest of their ten children.

Majorie attended high school at St. Joseph’s, a boarding school in Chapeau, Quebec. From there she went on to study at St. Mary’s Teacher’s College. Marjorie completed her Elementary Diploma of Primary Teaching in 1948. She attained her class “B” teaching Diploma for Elementary and Junior High School in 1968. In 1967 she attained a Diploma in Catechetical and Pastoral Formation from Divine Word in London and a Certificate of Catechetical Studies from McGill University in Montreal in 1971. In 1970 she completed the first level of the Counseling-Learning Institutes. In 1974 Sister Marjorie completed her Bachelor of Arts with Honours in Theology from the University of Loyola in Montreal and her Master of Arts in Religious Education at St. Paul’s University in Ottawa.

After finishing Teacher’s College, Marjorie taught in a one-room grade school on Allument Island, followed by a year in Quinnville, Quebec. During that summer, Marjorie began working part-time in the finance department of Atomic Energy of Canada Ltd and remained for the next twelve years, becoming Section Head of the Accounts Receivable Department. She then entered the Congregation of the Sisters of St. Joseph of Pembroke on October 11, 1963, during Vatican II. She received the habit in 1964 and took on the religious name Sister M. Amadeus. She then attained her studied at Divine Word in London, Ontario, attaining her diploma in 1967. After this, she returned to Chapeau to update her teaching credentials. She professed her final vows in August of 1970.
From 1967 to 1970 she taught at Our Lady of Lourdes School in Pembroke, Ontario. After, she became the Catechetical Consultant for the School Board until she left to pursue higher education in 1972. Sister Marjorie continued to do Pastoral Work until 1977 when she became the Director of Religious Education for the Diocese of Pembroke. She held the position for twelve years. Her accomplishments in this role include organizing pilgrimages to the Holy Land, sponsorship of refugees, the John Powell T.V. series “Free To Be Me,” and establishing the Ecumenical Way of the Cross, Families For Prayer, and the R.C.I. A. Program. For her efforts, Bishop Windle presented her with the Papal Medal of Bene Merenti. From 1985 to 1989, Sister Marjorie also served on the Congregational Leadership Team. She then went on sabbatical with the Sisters of St. Joseph of Orange, California. In 1991, the Leadership Team invited Sister Marjorie to renew the Associate Movement in the Congregation. Sister Marjorie was also instrumental in organizing numerous community programs such as the sponsorship of refugees, Families for Prayer, the RCIA Program, the Ecumenical Way of the Cross, and encouraging laity to become involved in the church. She continued this work, worked with the Federation of the Sisters of St. Joseph of Canada, and had a personal interest in ecological education. She was also heavily involved in Planting Seeds, a non-profit seeking to increase education in Guatemala.

Cathleen Flynn was born in London, Ontario on May 1, 1933. She entered the congregation on July 1, 1951, and received her habit on January 3, 1952. She made her final vows on January 3, 1957. Her religious name was Sister Mary Brendan. She was the daughter of Timothy Flynn and Mary McNally both of Ireland. Cathleen attended St. Mary's Elementary School, St. Angela's College, and Catholic Central High School in London, ON.

While in the novitiate, Sister Mary Brendan completed her teacher training at London Teachers' College in 1955. She then earned her BA at Assumption University in Windsor, ON, followed by her MA at Manhattanville College in New York, NY in 1967. She completed her STM in (Masters in Sacred Theology) at Regis College in Toronto in 1983, and her PhD in Ministry, also at Regis College in 1990.

From 1955-1961, Sister Mary Brendan was a teacher and principal in Windsor. She returned to London and taught at the same high school she had attended in her youth, from 1961-1963. She then served as Mistress of Novices at Mount St. Joseph Motherhouse in London from 1964-1971. As a member of the Commission of Religious, Sister Mary Brendan made a significant contribution to Synod II of the Diocese of London in 1969. She was then elected General Superior, a position she held from 1971-1979. As Superior General, Mother Mary Brendan was a member of the boards of the community's hospitals in London, Chatham, and Sarnia. The varied works of the Sisters involved her in separate school education as well as the private Mount St. Joseph's Academy and St. Joseph's School of Music in London. She was also involved in health care, social work, pastoral care, the mission field in the NWT and in Peru, care of the aged, and retreat programs.

Sister Cathleen then worked as the Assistant Director of Continuing Education at Regis College in Toronto from 1983-1986. While a student in the Doctor of Ministry Program at Regis College, she worked as the Director of Continuing Education from 1986-1990, and upon graduation, continued in this role until 2000. She then became the Director of the Master of Arts Degree program at Regis College in 2000, and then the Vice President of Regis College from 2001-2002. She served on the Board of Governors at Regis College from 2000-2005. Sister Cathleen also served on the Faculty Council, Academic Council, and Dean's Council at Regis College in 1996, on the Appointment and Rank Committee in 1998, as Vice Chair of the Academic Council in 2003, and was appointed Professor Emerita from 2007-2008. Sister Cathleen died on February 13, 2020.