Dan Buettner is an American explorer, educator, author and public speaker. He also co-produced a documentary and holds three world records for endurance bicycling. He is the founder of the online Quest Network, Inc., which provides opportunities for students to interactively engage with explorers on expedition. During his bicycling trips, Buettner became interested in demographics and longevity and began his research into "blue zones," a term for the regions on Earth with the longest life expectancy, disability-free life expectancy, or concentration of persons over 100. He began investigating these "blue zones" with physicians and demographers, and has authored several books on the topic. His latest is The Blue Zones Solution: Eating and Living Like the World's Healthiest People.