The young Albert was raised in a strict Calvinistic Scottish Presbyterian and Puritan tradition. His conversion of faith began under the ministry of Henry Grattan Guinness, a visiting evangelist from Ireland during the revival of 1859. Simpson spent some time in the Chatham, Ontario area, and received his theological training in Toronto at Knox College, University of Toronto. After graduating in 1865, Simpson was subsequently ordained in the Canada Presbyterian Church, the largest of the Presbyterian groups in Canada that merged after his departure for the United States. At age 21, he accepted a call to the large Knox Presbyterian Church (closed in 1971) in nearby Hamilton, Ontario.