MARK BITTMAN is the author of thirty acclaimed books, including the How to Cook Everything series, the award-winning Food Matters , and the New York Times number-one bestseller VB6: Eat Vegan Before 6:00 . For more than two decades his popular and compelling stories appeared in the New York Times , where he was ultimately the lead food writer for the Sunday magazine and became the country's first food-focused Op-Ed columnist for a major news publication. Bittman has starred in four television series, including Showtime's Emmy-winning Years of Living Dangerously . He has written for nearly every major newspaper and magazine in the United States, and has spoken at dozens of universities and conferences. His 2007 TED talk has more than four million views; in 2015 he was a distinguished fellow at the University of California, Berkeley. He is currently teaching at Columbia University's Mailman School'e¨of Public Health, editing Heated , an online food magazine, and writing a new book about understanding food. He can be found at markbittman.com, heated.

medium.com, @bittman on Twitter, and @markbittman on Instagram. DAVID L. KATZ, MD, MPH, FACPM, FACP, FACLM, is the founding director of Yale University's Yale-Griffin Prevention Research Center , past-president of the American College of Lifestyle Medicine , and founder/president of the True Health Initiative, a nonprofit organization that promotes messages about healthy, sustainable diet and lifestyle. Katz earned his BA degree from Dartmouth College; his MD from the Albert Einstein College of Medicine; and his MPH from the Yale University School of Public Health. The recipient of many awards for his contributions to public health, he has received three honorary doctorate degrees. He has authored roughly 200 peer-reviewed publications and many hundreds of health columns both online and in print, and 17 books to date, including leading textbooks in both preventive medicine and nutrition. Katz is recognized globally for expertise in nutrition, weight management, and the prevention of chronic disease.

He has a social media following of nearly one million. Find him at davidkatzmd.com, truehealthinitiative.org, and @DrDavidKatz on Twitter.