Dean Karnazes

Karnazes has stated that his next challenge is to run a marathon in every officially recognized country in the world, all within a year. Karnazes said he hopes to undertake the feat in 2018.

At first, Karnazes ran direct routes from school to his home. Later, he began to run diversionary routes that would extend his run and take him into uncharted territory. By third grade, he was participating in and organizing short running events with other children. As Karnazes grew older, he began testing his limits: by age eleven he had hiked rim-to-rim across the Grand Canyon and had climbed Mount Whitney, the highest mountain in the contiguous United States; for his 12th birthday, he cycled 40 miles (64 km) to his grandparents' home for fun without telling his parents.

In 2011, Karnazes opened a Frozen-Yogurt shop in San Anselmo, California called U-Top It.

According to his sponsor, Karnazes has been featured on The Today Show, 60 Minutes (2009), The Late Show with David Letterman, CBS News, CNN, ESPN, The Howard Stern Show, NPR's Morning Edition, Late Night with Conan O'Brien, and the BBC. He has also appeared on the cover of Runners' World, Outside, and Wired magazines, and has been featured in TIME, Newsweek, People, GQ, The New York Times, USA TODAY, The Washington Post, Men's Journal, Forbes, The Chicago Tribune, The Los Angeles Times, and the London Telegraph, among others. Karnazes won Competitor magazine's "Endurance Athlete of the Year" award three times, and also earned ESPN's ESPY award.

The adventure was the primary subject of film director JB Benna's 2008 film entitled UltraMarathon Man: 50 Marathons - 50 States - 50 Days, which was the first feature film about Karnazes. The film was produced by Journeyfilm, had a national theatrical release in 300 screens in 2008 and was released on DVD and Blu-ray in 2009.

His father worked as a field naturalist for the Orange County Department of Education in 2006. The younger Karnazes brother grew up in Diamond Bar, California and San Clemente, California. In 2006 he said that he remained close to the friends he made at San Clemente High School, which was also attended by both his siblings. Growing up in the city of San Clemente gave him a love of the outdoors, and an appreciation of its small-town feel. At the time his parents still lived in the house where he had grown up.

In 2006, Karnazes embarked on the well-publicized Endurance 50: 50 marathons in 50 states in 50 consecutive days. Beginning with the Lewis and Clark Marathon in St. Louis on September 17, 2006, it finished with the New York City Marathon on November 5. Eight of the 50 races were conventional marathon races. Since marathon races are typically held only on weekends, on the other days Karnazes (accompanied by between one and 50 runners) ran the course of a marathon in each state using the help of the race director and staff of each event to officially run the certified course, but on a different day than the "live" event. (For example, as part of the 50/50/50, Karnazes ran the official course of the Boston Marathon, but not the race itself, which is held in mid-April.)

After finishing the 50/50/50, Karnazes decided to run home to San Francisco from New York City. He was expected to finish the trip in January 2007. However Karnazes chose to end this trek December 15, 2006, in St. Charles, Missouri, to spend more time with his family.

In 2004, Karnazes was named one of GQ's "Best Bodies of the Year".

In 1995, Karnazes founded Energy Well Natural Foods in San Francisco and he remains president of the company, now called Good Health Natural Foods. Karnazes is also a regular columnist for Men's Health.

In 1976, as a high school freshman at San Clemente High, Karnazes joined the cross country team under Benner Cummings. Cummings' running theory was that running is about finding your inner peace; his motto was "run with your heart". That season, Karnazes was awarded "Most Inspirational" team member. Karnazes also ran his first endurance event that year, a fundraising run on a track for underprivileged children, finishing in just under six hours and raising a dollar a lap from his sponsors. While most students ran only 10–15 laps around the track, he ran 105, a full marathon.

Dean Karnazes (English: /k ɑː r ˈ n ɛ ˈ z ɪ s / car-NEH -zis; born Constantine Karnazes; August 23, 1962), is an American ultramarathon runner, and author of Ultramarathon Man: Confessions of an All-Night Runner, which details ultra endurance running for the general public.

Karnazes met his wife Julie in 9th grade at San Clemente High School. Karnazes' children accompanied their father for much of his run of 50 marathons in 50 states, as they were home-schooled at the time.