BOB HARPER, trainer on The Biggest Loser, is known as the go-to trainer for Hollywood's elite and counts Gwyneth Paltrow, Ben Stiller, Ellen DeGeneres, Melissa Etheridge, and Laura Dern among his past and present clients. He lives in Los Angeles.
MAGGIE GREENWOOD-ROBINSON, PhD, is a leading health and medical writer. She has authored or coauthored more than 30 books, including Good Carbs versus Bad Carbs and The Bikini Diet. She has a doctorate in nutritional counseling.