Dr. Caldwell Esselstyn is an American physician and author known for his research in plant-based nutrition and its effects on heart disease. He served as a surgeon at the Cleveland Clinic and has published numerous studies demonstrating how a whole-food, plant-based diet can prevent and even reverse cardiovascular disease. Esselstyn is the author of the book Prevent and Reverse Heart Disease, which outlines his dietary approach and provides guidelines for adopting a plant-based lifestyle. His work has influenced many individuals seeking to improve their health through nutrition, and he is a prominent advocate for the benefits of a vegan diet.