In 1994 he appeared on two British television programs, the bioethics series Brave New World and a special edition of the live discussion program After Dark. From 1995–2000, Fisher was a lecturer at the Australian Catholic University in Melbourne. From 2000 to 2003 he was the foundation director of the John Paul II Institute for Marriage and Family in Melbourne, the Australian campus of a postgraduate pontifical institute with nine campuses around the world. The principal work of the institute was in teaching and research on questions concerning respect for human life and the dignity of the person and support for marriage and family life. The Australian campus ceased operations in December 2018. He is ex officio chancellor of the Catholic Institute of Sydney (having previously served as the deputy-chancellor) and Adjunct Professor of Bioethics at the University of Notre Dame Australia. Prior to his episcopal appointment, Fisher was the Master of Students (seminarians) and Socius (deputy) to the prior provincial of the Dominican order in Australia and New Zealand. In the Melbourne archdiocese, he was Episcopal Vicar for Healthcare, spokesman for the archdiocese on matters of ethics, a visiting lecturer at the Catholic Theological College and secretary to the Senate of Priests. His community engagements have included being Chaplain to the Parliament of Victoria, a member of the Infertility Treatment Authority of Victoria, chair or member of several hospital ethics committees, a conventual chaplain ad honorem to the Sovereign Military Order of Malta and a chaplain to various other organisations. He has also had various engagements in parish life and the pastoral care of the handicapped and the dying. In August 2003, Fisher debated euthanasia activist Philip Nitschke at the Great Hall of the University of Sydney. Episcopate Auxiliary Bishop of Sydney Fisher was appointed an auxiliary bishop of Sydney and titular Bishop of Buruni by Pope John Paul II on 16 July 2003 and consecrated by Cardinal George Pell at St Mary's Cathedral, Sydney, on 3 September 2003. He took "Speaking the truth in love" (Ephesians 4:15) as his episcopal motto. He was the parish priest of Our Lady Star of the Sea Church, Watsons Bay and Episcopal Vicar for Life and Health in the Archdiocese of Sydney, as well as serving on the Australian Bishops' Commission for Doctrine and Morals and as chair of the Catholic Schools Board, chair of the Catholic Education Commission of New South