H.A. Ironside, along with others such as Cyrus Scofield, was influential in popularizing dispensational theology among Protestants in North America. Despite his lack of formal education, his tremendous mental capacity, photographic memory and zeal for his beliefs caused him to be called, "the Archbishop of Fundamentalism."
Ironside was one of the most prolific Christian writers of the 20th Century and published more than eighty books and pamphlets, a number of which are still in print. He also wrote the popular hymn Overshadowed. One editorial reviewer wrote of a 2005 republication that, "Ironside's commentaries are a standard and have stood the test of time."