He studied at Gonzaga University in Spokane, Washington, where he obtained his Master of Philosophy degree[1] On June 3, 1966, Sevilla was ordained to the priesthood for the Society of Jesus in Rome by Archbishop John Quinn.
Sevilla received his episcopal consecration at the Cathedral of Saint Mary of the Assumption in San Francisco on January 25, 1989, from Archbishop John Quinn, with Bishops Mark Hurley and Michael Kaniecki serving as co-consecrators.
[1] Within the United States Conference of Catholic Bishops (USCCB) Sevilla sat on the Committee for Ecumenical and Interreligious Affairs and the Sub-Committee for Translation of Liturgical Texts into Spanish.
[4] In May 8, 2008, Sevilla admitted that he failed to notify parishioners in the diocese about Reverend Jose Joaquin Estrada Arango, who had been convicted in 2008 of fondling a 14-year-old girl in Oregon.
[1] In 2014, Sevilla testified in a civil lawsuit against the diocese The plaintiff claimed to have been sexually assaulted in 1999 at age 17 by seminarian Aaron Ramirez at Resurrection Catholic Church in Zillah, Washington.