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Part of the Atheist Debates Patreon project: / atheistdebates
Dan Barker is co-president of the Freedom From Religion Foundation (ffrf.org). He famously journeyed from preacher to atheist and has been in more than 120 formal public debates, making him a great resource for those interested in debating.
Filmed at the FreeFLO.org humanist convention in November, 2015.