Web Reference: Mark Sisson (born July 20, 1953) is an American fitness author, food blogger, and a former distance runner, triathlete and Ironman competitor. [1] 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. [2] Aug 6, 2024 · Mark Sisson is a 71-year-old fitness instructor, athlete, successful entrepreneur, and social media sensation. He has been happily married to his wife Carrie Sisson and boasts an estimated net worth of $10 million. Jan 4, 2026 · Mark was born in Maine, New England, the United States, on July 20, 1953, and is now 68. Despite his age, he can still run far distances, but he has already retired from being a distance runner because even though his body can do it, problems might arise in the future.
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Details: $74M - $92M
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Last Updated: April 2, 2026
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