Dr. Andrus began his study of the gospel as a young boy on a ditch bank in Idaho while watching a stream of irrigation water. His father had caught him looking through a copy of Parley P. Pratts, “Key to Theology” to which his father told him the book would be far to hard for him to understand. He spent his time reading the book while tending to his duties at the irrigation ditch.
His in-depth study continued when he was drafted in the army during World War II and then as a missionary to the East Central United States.
He went on to get a Master¹s degree from BYU and a PhD from Syracuse University focusing on the religious and political thoughts of the Prophet Joseph Smith. He accepted a teaching assignment in the BYU Religion Department where he became a popular teacher of undergraduate courses on the Book of Mormon, Pearl of Great Price and Doctrine and Covenants, often requiring larger classrooms to accommodate the demand. He also taught graduate level theology and various seminars. Dr. Andrus served as curator of the "Mormon Experience," the collection of LDS documents and manuscripts in the Harold B. Lee Library until he retired from BYU.
In April 2002, the American Biographical Institute, of which Dr. Andrus was a deputy governor, inducted him into the Leading Intellectuals of the World Hall of Fame. And the International Biographical Centre in Cambridge, England, includes his biography in 2000 Outstanding Writers of the 20th Century, 2000 Outstanding Intellectuals of the 21st Century, and 500 Founders of the 21st Century and presented him with the Da Vinci Diamond award.
He has written several books and articles and participated in the Know Your Religion speaking series as well as several special lecture series on the Book of Mormon, Doctrine and Covenants and Pearl of Great Price. Dr. Andrus is known for his well-documented, in-depth, doctrinal approach to gospel study.