For more than 30 years, Dean Ornish, M.D.and his colleagues at the non-profit Preventive Medicine Research Institute (PMRI) in collaboration with the University of California, San Francisco and other leading academic institutions, have conducted a series of research studies showing that changes in diet and lifestyle can make a powerful difference in our health and well-being, how quickly these changes may occur, and how dynamic these mechanisms can be. He is the author of Reversing Heart Disease and six other books regarding health. His new book, UnDoIt, will be released in Jan 2019..