Thomas A. Tiscornia was born on February 5, 1944 in Hoboken, New Jersey, son of August and Evelyn Nolan Tiscornia. He has three brothers and two sisters. He attended Our Lady of Mount Carmel Grammar School in Tenafly, Saint Cecilia High School in Englewood and Seton Hall University in South Orange, New Jersey where he received a B.S. in Secondary Education, and entered Maryknoll at Glen Ellyn, Illinois in September, 1966. He attended the Summer Institute on Sub-Saharan Africa at Notre Dame University in 1970 prior to going to Tanzania for two years where he did his Overseas Training Program.
Father Tiscornia was ordained at Maryknoll, New York on May 19, 1973 and was assigned to the Maryknoll Mission Region in Africa. There he took up pastoral work in the Diocese of Musoma, Tanzania serving at Masonga and Nyarombo parishes as well as several years in secondary school chaplaincy. In mid-1980 he returned to the United States for home leave and the Spiritual Renewal Program and in November 1980 was assigned to the United States Region to work specifically in the Task Force for Vocation Recruitment. In January 1982 he was assigned again to the Tanzania Region where he returned to pastoral ministry in Mugumu and Kowak parishes. Father Tiscornia became a member of the Society team of five sent from Africa to work in the Diocese of El Obeid, Sudan in January 1987. After two years of studying Arabic, his first pastoral assignment to the parish of Babanusa, with a fellow Maryknoller, was cut short by the government refusal to allow the priests to minister to the people. He eventually exchanged places with a Sudanese priest and served as rector of St. Kizito seminary until April 1992.
Father Tiscornia was assigned to the United States Region and to formation work on November 1, 1992. He was appointed to the Society's Priesthood Formation Team and in this capacity joined the Formation Staff at the Seminary Residence in Chicago. In addition to his responsibilities in formation work, he was assigned by the General Council in January 1993 as the Society's Africa representative on the Advisory Committee for Peace and Justice.
In September 1995, Father Tiscornia was assigned to the Tanzania Region where he has continued to exercise his pastoral ministry at Mtoni parish in Dar es Salaam. He returned to work with the Church in the Sudan during the latter part of 1998 in the liberated area of the Diocese of El Obeid serving in the Nuba Mountains. There he worked with members of the Apostles of Jesus, an East African missionary congregation. On October 1, 2001, Tom will assume the position of Regional Superior for Maryknoll in Africa. After six years of service in Leading the Region, Tom returned to ministry in the Nuba Mountains, Sudan.