He was ordained a priest on the 17 March 1963 and made his religious profession into the order of Discalced Carmelites on 3 October 1968. He was named Bishop of Meaux, 27 August 1986, consecrated on the 19 October 1986 by the archbishop of Paris, cardinal Jean-Marie Lustiger.
A few months later, 7 May 1987, he was named auxiliary bishop of Bayeux-Lisieux in residence at Lisieux. He remained in this post until the 1 July 2005 at which time he retired having reached the age limit.
At first a specialist in the writings of Georges Bernanos, he subsequently devoted his attention to the personality and writings of Thérèse of Lisieux. Amongst his many editorial works, he notably participated in the centenary Edition of the works of Thérèse. 
- Gaucher, Guy. The Story of a Life: St. Thérèse of Lisieux. San Francisco: Harper & Row, 1987. ISBN 978-0-06-063095-9 Over copies in US libraries, according to WorldCat
- Review, Catholic Historical Review, Apr., 1989, vol. 75, no. 2, p. 304-305
- Gaucher, Guy. John and Thérèse: Flames of Love : the Influence of St. John of the Cross in the Life and Writings of St. Thérèse of Lisieux. Staten Island, N.Y.: Alba House, 1999.
- Thérèse, Guy Gaucher, and Aletheia Kane. The Prayers of Saint Thérèse of Lisieux: The Act of Oblation. Washington, DC: ICS Publications, 1997.
- Gaucher, Guy. The Passion of Thérèse of Lisieux: 4 April - 30 September 1897. New York: Crossroad, 1990.
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