Leonard James Arrington was an American author, academic and the founder of the Mormon History Association. He is known as the "Dean of Mormon History" and "the Father of Mormon History" because of his many influential contributions to the field. Since 1842, he was the first non-general authority Church Historian for the Church of Jesus Christ of Latter-day Saints, from 1972 to 1982, and was director of the Joseph Fielding Smith Institute for Church History from 1982 until 1986.

Church Historian and Recorder is a priesthood calling in the Church of Jesus Christ of Latter-day Saints. The role of the Church Historian and Recorder is to keep an accurate and comprehensive record of the church and its activities. His office gathers history sources and preserves records, ordinances, minutes, revelations, procedures, and other documents. The Church Historian and Recorder also chairs the Historic Sites Committee and Records Management Committee, and may act as an authoritative voice of the church in historical matters.