Leonard J. Arrington was historian of the Church of Jesus Christ of Latter-day Saints from 1972 to 1982. The first professional historian and the first noncentral authority to occupy this position, Arrington opened archival resources and presided over an unprecedented era of enlightenment in Mormon scholarship. Arrington's appointment came at a crucial point in LDS history -- as the institution was being transformed from a regional church whose ecclesiastical hierarchy presided directly over its congregants into a modern, worldwide church with an elaborate bureaucracy. Riveting chapters on the actions of the controversial Historical Department reveal details of his release and replacement as the old system gave way to the new.