Daniel Edwin Barker is an American atheist activist and musician who served as an evangelical Christian preacher and composer for 19 years but left Christianity in 1984. He and his wife Annie Laurie Gaylor are the current co-presidents of the Freedom From Religion Foundation, and he is cofounder of The Clergy Project. He has written numerous articles for Freethought Today, an American freethought newspaper. He is the author of several books including Losing Faith in Faith: From Preacher to Atheist.

The Freedom From Religion Foundation (FFRF) is an American nonprofit organization that advocates for atheists, agnostics, and nontheists. Formed in 1976, FFRF promotes the separation of church and state, and challenges the legitimacy of many federal and state programs that are faith-based. It supports groups such as nonreligious students and clergy who want to leave their faith.