An American Christian clergyman, Bible teacher, conference speaker and a prolific writer of Christian literature and theological works, Wiersbe is perhaps best known for his series of 50 books in the “BE” series: Be Real, Be Rich, Be Obedient, Be Mature, Be Joyful, etc., and other theological works. He pastored the Moody Church in Chicago (1971–1978) and succeeded Theodore Epp as director of the Back to the Bible radio ministry.