Dr. Will Bulsiewicz (or "Dr. B") is an award winning gastroenterologist, internationally recognized gut health expert and the New York Times, Publishers Weekly, USA Today, and Indie Bound-bestselling author of Fiber Fueled and The Fiber Fueled Cookbook. With a passion for plants and helping people, he is the U.S. Medical Director and sits on the Scientific Advisory Board of ZOE, has authored more than twenty articles published in peer-reviewed scientific journals, has given more than forty presentations at national meetings, presented to Congress and the USDA, and has taught over 10,000 students how to heal and optimize their gut health.

He completed a bachelor’s degree from Vanderbilt University, a medical degree from Georgetown University, and a master's in clinical investigation from Northwestern University. Dr. B was the chief medical resident at Northwestern and the chief gastroenterology fellow at The University of North Carolina, and received the highest award given by both his residency and fellowship. He completed an epidemiology fellowship on a grant from the National Institutes of Health at UNC's prestigious Gillings School of Global Public Health.