Fr Hennessey is responsible for the Vocation Office, which focuses on promoting vocations to the Diocesan Priesthood and creating a Culture of Vocations throughout the Archdiocese of Boston. He grew up in Saint Augustine Parish, Andover, attended Central Catholic High School in Lawrence and earned a BA in Biology from Merrimack College, after which he worked in the field of Biotech Genetics Research. Fr. Hennessey entered St. John's Seminary in 1996 and was ordained to the Priesthood by Bernard Cardinal Law in 2002. Prior to serving in the vocation office he served as Parochial Vicar at Saint Brigid Parish and Gate of Heaven Parish in South Boston.