Neal Barnard is an American physician, author, and clinical researcher known for his work in nutrition and health. He is the founder of the Physicians Committee for Responsible Medicine, an organization that promotes plant-based diets and ethical research practices. Barnard has published numerous books and scientific articles focusing on the benefits of a vegan diet for health and disease prevention. In addition to his advocacy for plant-based nutrition, Barnard has conducted research on the effects of diet on various health conditions, including diabetes and heart disease. He is a frequent speaker at health conferences and has appeared on various media platforms to discuss the importance of dietary choices in improving overall health.