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Dean Karnazes is an American ultramarathon runner and author. He is known for his ability to run long distances without getting tired. He has run 50 marathons in 50 states in 50 consecutive days, and he has run 350 continuous miles without sleep. He is the author of several books, including Ultramarathon Man: Confessions of an All-Night Runner.

Karnazes was born in Inglewood, California, in 1962. He attended California Polytechnic State University at San Luis Obispo, where he studied food science technology. After graduating, he worked as a marketing manager for a food company.

In 1995, Karnazes was diagnosed with anemia. He began running as a way to improve his health, and he quickly realized that he had a natural talent for it. He began competing in ultramarathons, and he quickly became one of the top ultrarunners in the world.

Karnazes is a motivational speaker and author. He has written several books about his running experiences, including Ultramarathon Man: Confessions of an All-Night Runner, The Road to Sparta, and A Runner's High. He is a frequent speaker at corporate events and conferences.

Karnazes is married and has two children. He lives in San Francisco, California.