Seage was elected as bishop coadjutor during his tenure as rector at St. Columb's in Ridgeland, Mississippi, where he served since 2005.
He holds an undergraduate degree from Pepperdine University and a master's of divinity from the Episcopal Theological Seminary of the Southwest.
From 1997 to 1998, Seage served as curate at St. John's, Ocean Springs, and then as rector of St. Thomas Episcopal Church in Diamondhead from 1998 to 2005, growing both attendance and programming in the parish.
A successful building program was completed and average Sunday attendance doubled during his ministry at St. Thomas.
Before entering the priesthood, Seage served as director of youth ministry for St. Patrick's Episcopal Church in his native Thousand Oaks, California.