Bob Harper is a world-renowned fitness trainer and the longest-reigning star of the NBC reality series The Biggest Loser, which has run for sixteen seasons, and counting. He has released several popular fitness DVDs and is the #1 New York Times bestselling author of The Skinny Rules, Skinny Meals, and Jumpstart to Skinny. Harper lives in Los Angeles.
Greg Critser is a longtime science and medical journalist. The co-author of Bob Harper's The Skinny Rules and Jumpstart to Skinny, Critser is also the author of the international bestseller Fat Land: How Americans Became the Fattest People in the World. He lives in Pasadena, California.