Brian Altmiller attended Columbia Christian College, in Portland, Oregon; Oklahoma Christian University in Oklahoma City; Harding University in Searcy, Arkansas; Harding Graduate School of Bible and Religion in Memphis, Tennessee and Pepperdine University in Malibu, California. He holds the Bachelor of Arts in Bible from Harding University in 1965; and Master Degree in Missions and Bible from Pepperdine University in 1967. He also holds the Master's Degree in Cross Cultural Teaching from Eastern Oregon State University.

He and his wife Retta, served as missionaries in the West Indies; and he preached for several years in Montana. He taught Kindergarten and Special Education and was a Caseworker for the State of Washington for Seven years. He and his wife, were co-managers of a Christian retirement center in Exeter, California. before moving to Searcy, Arkansas.

Since 1996, Brian has spoken in numerous congregations in several states sharing his passion for equipping national teachers and missionaries through the work of Truth for Today World Mission School. He and Retta have 2 Children.