Andrew Thomas Weil is an American author and physician, best known for establishing and popularizing the field of integrative medicine. Weil is the author of several best-selling books and runs a website and monthly newsletter, where he answers questions relating to health. He is the founder and Program Director of the Arizona Center for Integrative Medicine , which he started in 1994 at University of Arizona. He has become one of the leading proponents of integrative medicine. He founded Weil Lifestyle LLC.