Prior to his service in Brooklyn, Tiedemann was the bishop of Mandeville, Jamaica — a position to which Pope Benedict XVI also appointed him. Tiedmann held that office for eight years.
A member of the Passionists, Tiedemann was ordained to the priesthood on May 16, 1975, in the Brooklyn Diocese.
He served as parochial vicar at Immaculate Conception Parish in Jamaica, Queens, for his first assignment from 1975–1982. He also served at St. Joseph Catholic Church in Union City, New Jersey, and Blessed Sacrament in Springfield, Massachusetts, both parishes with large Hispanic presences.
During his time ministering in Tegucigalpa, Honduras, Tiedemann helped establish an AIDS hospice called Casa Pasionista.
From 1998–2005 he served at Visitation of the Blessed Virgin Mary Church in the Red Hook neighborhood of Brooklyn, where both his grandparents and great grandparents were married.
Tiedemann was elected to the provincial council of the Passionists in 2006.
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