He previously served as an auxiliary bishop of the Archdiocese of Philadelphia from 2009 to 2023, as well as rector and later chancellor of St. Charles Borromeo Seminary in Pennsylvania.
[3] After his 1985 ordination, the archdiocese assigned Senior as parochial vicar at Assumption of the Blessed Virgin Mary Parish in Feasterville, Pennsylvania.
[2] In this position, he oversaw the governance and operation of the network of Catholic health care and social services ministries sponsored by the archdiocese.
[2] In addition to his duties as vicar, he resided at and served as chaplain at Divine Providence Village, a facility for people with intellectual disabilities, in Springfield, Pennsylvania.
[4] Senior received his episcopal consecration on July 31, 2009, from Rigali, with Bishops Michael Bransfield and Daniel E. Thomas acting as co-consecrators, at the Cathedral Basilica of Ss.