Mark Sisson

Health and fitness writer and the founder of Primal Nutrition, a health supplement company. After graduating from Williams College with a major in biology, Sisson was a champion marathon runner, triathlete, and Ironman competitor. He is the former head of the Anti-Doping Commission of the International Triathlon Union (ITU), where he was responsible for the drug testing and education of competitive athletes from around the world. Sisson’s blog,, dispenses information and advice on health, nutrition, and fitness.