Bob Greene is an exercise physiologist and certified personal trainer specializing in fitness, metabolism, and weight loss. He is the bestselling author of The Best Life Diet, The Total Body Makeover, Get With the Program!, and the coauthor of Make the Connection. He is also a contributing writer and editor for O the Oprah magazine, and writes articles on health and fitness for Oprah.com.
Harold Lancer, MD, is a Beverly Hills dermatologist. Diane L. McKay, PhD, is a nutrition specialist and scientist at Tufts University. Ronald L. Kotler, MD, is cofounder of the Pennsylvania Hospital Sleep Disorders Center.