Dr. Dean Ornish is a physician, researcher, and Founder and President of the nonprofit Preventive Medicine Research Institute. He is a clinical professor of medicine at the University of California, San Francisco, and the author of seven books, all national bestsellers. Dr. Ornish has directed revolutionary research proving, for the first time, that lifestyle changes can often reverse-undo-the progression of many of the most common and costly chronic diseases and potentially even begin reversing aging at a cellular level.

Mary Purdy, MS, RDN is an integrative eco-dietitian and nutrition educator with a Master's Degree from Bastyr University, where she is currently adjunct faculty. She has been in clinical practice for over 12 years using a personalized medicine and functional nutrition approach. In addition to being the host of The Good Clean Nutrition Podcast, she had her own podcast, The Nutrition Show, with 100+ episodes, and has authored two books, Serving the Broccoli Gods and The Microbiome Diet Reset. Mary also teaches for other universities and educational platforms, is a nutrition and sustainability adviser for Big Bold Health, and is a sought-after speaker, consultant and community builder working with organizations to create a more sustainable, just and resilient food system. Learn more about Mary at www.marypurdy.co.