Michael Greger is an American physician, author, and speaker known for his work in nutrition and public health. He is the founder of NutritionFacts.org, a non-profit organization that provides evidence-based information on the health benefits of a plant-based diet. Greger emphasizes the importance of whole foods and lifestyle changes in preventing and treating chronic diseases. He has written several books, including How Not to Die and How Not to Diet, which focus on the role of diet in health and disease prevention. Greger is also a prominent advocate for the use of scientific research to inform dietary choices and promote overall well-being.