Sr. Mary Sullivan, OSU, formerly Sr. Karen, a beloved member of the Ursulines of the Roman Union Eastern Province, USA, entered eternal life on Aug. 17, 2026, at Andrus on Hudson Nursing Home.

Sr. Mary was born in the Bronx on July 23, 1940, the eldest child of Katherine Cahill and Patrick Sullivan, both from County Kerry, Ireland. She professed vows in the Ursuline Community on Jan. 6, 1963. Sr. Mary earned a bachelor’s degree in English from the College of New Rochelle and a master’s degree in English from St. Michael’s College in Colchester, Vermont. She began her teaching ministry at Blessed Sacrament School in New Rochelle, St. Jerome’s in the Bronx, Notre Dame, and St. Joseph’s Ursuline Academy in Malone. She later served on the boards of trustees of the College of New Rochelle, Academy of Mount St. Ursula, and The Ursuline School. One of her fondest educational ministries was teaching peace education at St. John Chrysostom School in the Bronx.

Responding to a new call, Sr. Mary pursued certification in Clinical Pastoral Education at Walter Reed Hospital and Memorial Sloan Kettering Hospital. She served in chaplaincy and pastoral care positions at Memorial Sloan Kettering, Lincoln Hospital, St. Clare’s Hospital, and Calvary Hospital in New York. Recognizing her gifts in pastoral care, Calvary Hospital appointed Sr. Mary as assistant director of pastoral care.

Advocacy for justice was an integral part of Sr. Mary’s life. She was involved in the Ursuline Roman Union JPIC (Justice, Peace and the Integrity of Creation) projects, demonstrations at the School of the Americas, and the initiation of a Madeleva Reflection Group, which met regularly to explore the Christian feminist vision of full humanity for all persons and right relationships among all creatures. As a member of the Interfaith Center for Corporate Responsibility, Sr. Mary was invited to be part of the U.S. delegation serving as human rights monitors and observers of Orange Order parades held in Northern Ireland. She was assistant director of Siena House, which provides transitional housing for pregnant women and young mothers. Her concern for immigrants also led her to volunteer at Catholic Social Services in Laredo, Texas.

Within the Ursuline community, Sr. Mary served in several leadership positions, including provincial and local superior. Her gifts as a spiritual director were central to her role as director of all stages of Ursuline formation.

Sr. Mary will be remembered by her Ursuline Sisters, family, and friends for her leadership, compassion, and vision of a future where all will be part of God’s peaceful kingdom.

She was predeceased by her brothers, John and James, and survived by her sister, Eileen Barrett; her sister-in-law, Pam Sullivan; and many loving nieces and nephews.

Visitation for Sr. Mary will be held on Monday, Aug. 24, from 3:00 to 7:00 p.m., with a prayer service at 4:30 p.m. at the Ursuline Province Center, 1338 North Avenue, New Rochelle, 10804.

The Funeral Mass will be celebrated on Tuesday, Aug. 25, at 10:30 a.m. at the Ursuline Province Center, 1338 North Avenue, New Rochelle, 10804.

The Funeral Mass will be live-streamed on Facebook.

Donations in Sr. Mary’s memory may be made to the Ursuline Sisters Development Office, 1338 North Avenue, New Rochelle, 10804.