Mark Sisson is an American entrepreneur, fitness author, and food blogger. He founded Primal Kitchen in 2014 and sold it to Kraft in 2019. He also started Peluva shoes in 2021, where he is an owner. Sisson was previously an owner of Primal Kitchen and Primal Nutrition, LLC.

Beyond his entrepreneurial ventures, Sisson is known as a fitness author and food blogger. He is a former distance runner, triathlete, and Ironman competitor, and served as Executive Director at Usa Triathlon.