Bishop Jean-Yves Nahmias was born on September 16, 1957 in Saint-Mand, near Paris, in the Roman Catholic Diocese of Créteil in Créteil, France. He studied at the University of Paris I, where he has been a member of G.F.U. (Groupes de Formation Universitaire); he graduated with a License in Financial Law. He pursued his studies in philosophy and theology for two years at the Pontifical Gregorian University in Rome, then as a student of the French Seminary in Rome, and then in the Institute of Theological Studies in Brussels, where he obtained a Licentiate in Sacred Theology in 1991. Nahmias was ordained to the priesthood on June 24, 1989, and was incardinated for service to the Roman Catholic Archdiocese of Paris. Nahmias served as Parochial Vicar (Assistant Pastor) at the Parish of Notre-Dame de la Croix, Paris, and as a Chaplain in Public Schools Jean-Baptiste-Clément, Etienne Dolet and Martin Nadaud (1990-1994). In addition, from 1992 to 1996, was in charge of the Diocesan Service for Vocations, and from 1993, Director of Office for Vocations. Later, he was the Parochial Vicar at the Parish Saint-Ambroise, and a Chaplain in Public Schools Voltaire and Alain-Fournier