T. Colin Campbell is an American biochemist and nutrition expert known for his research on the relationship between diet and health. He is best known for his role in the China-Cornell-Oxford Project, a comprehensive study that examined the effects of nutrition on disease rates in rural China. His findings emphasized the benefits of a plant-based diet. Campbell has authored several influential books, including The China Study, which advocates for a whole-food, plant-based diet to prevent and reverse chronic diseases. He is also a co-founder of the T. Colin Campbell Center for Nutrition Studies, which promotes education and research in nutrition.