Dr. Katz is a globally recognized specialist in preventive medicine and lifestyle medicine, with expertise in nutrition. A highly respected author and recipient of numerous awards for teaching, writing, and contributions to public health, Dr. Katz has received three honorary doctorate degrees and is also a Fellow of the American College of Preventive Medicine, the American College of Physicians, and the American College of Lifestyle Medicine. In addition to his work with Diet ID, he is the founder and former director of Yale University’s Yale-Griffin Prevention Research Center, Past President of the American College of Lifestyle Medicine, and President and Founder of the non-profit True Health Initiative.

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.