Mark Sisson
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Mark Sisson (born July 1953) is an American fitness author, food blogger, and a former distance runner, triathlete and Ironman competitor.

Sisson was born in Maine and is the oldest of four siblings. He attended Williams College, where he was a pre-med candidate and earned a biology degree.

Sisson is married to his wife Carrie. They have two children. Sisson is a follower of the paleo diet and markets his own version of it, called the "Primal Blueprint" diet.. As part of this initiative, he started a food blog, "Mark's Daily Apple", in 2006 and has also written a number of diet and exercise books, including the best-selling book, The Keto Reset Diet: Reboot Your Metabolism in 21 Days and Burn Fat Forever.

Sisson finished 4th in the February 1982 Ironman World Championship. In the 1970s, he was a record-setting runner for the Portland (Maine) Track Club. He had a top-5 finish in the 1980 U.S. National Marathon Championships and earned a qualifying spot for the 1980 U.S. Olympic Trials.