A member of the Sisters of Loretto, Sister Mary Luke is a catalyst for renewal in religious communities, a worker for peace and justice worldwide, a promoter of equality for women, a mentor of women and men of all faiths, and an advocate for their empowerment. She was one of only 15 women worldwide to be invited to the Second Vatican Council in Rome. She has traveled and stood with others in Northern Ireland, El Salvador, California, Colorado, and Washington, DC, on behalf of various issues and struggles. Tobin visited Saigon in 1970 to promote peace in Vietnam. She also participated in international hearings on disarmament in Amsterdam. In 1993 she joined a delegation that studied the rise of neo-Nazism in Germany. Tobin has recorded her experiences in the book “Hope is an Open Door” and in numerous periodical articles.