Dan Buettner is an American explorer, author, and National Geographic Fellow known for his research on longevity and healthy living. He is best recognized for identifying the Blue Zones, regions in the world where people live significantly longer and healthier lives. His work emphasizes lifestyle habits that contribute to longevity, such as diet, physical activity, and social connections. Buettner has authored several books, including "The Blue Zones: Lessons for Living Longer From the People Who've Lived the Longest." Through his research, he aims to inspire individuals and communities to adopt healthier lifestyles by learning from the practices of those in Blue Zones like Okinawa and Sardinia.