A.B. Simpson, or Albert Benjamin Simpson, was a Canadian preacher, theologian, and founder of the Christian and Missionary Alliance (C&MA) in 1887. Born on December 15, 1843, in Bayview, Prince Edward Island, he emphasized the importance of missions and spiritual growth in the Christian faith. His teachings focused on the deeper life and the work of the Holy Spirit. Simpson was also a prolific writer, authoring numerous books and hymns that contributed to the Christian community. He played a significant role in promoting global missions, encouraging believers to engage in outreach and service. His legacy continues through the ongoing work of the C&MA worldwide.