Samuel Zwemer (1867-1951) was a Dutch-American missionary who dedicated his life to bringing Christianity to Muslims. He grew up in a missionary family and felt called from a young age to take the gospel to followers of Islam. After facing rejection from missionary boards, he co-founded the American-Arabian Mission. Throughout his career, he traveled extensively in the Middle East, wrote prolifically advocating for missions to Muslims, and trained future missionaries. Though he saw few Muslim converts himself, Zwemer laid important groundwork for later missionary efforts and helped mobilize Christians worldwide to reach Muslims with the gospel.