Jeff O'Connell is editorial director and publisher at Bodybuilding.com, part of Liberty Media Corporation. He was formerly editor-in-chief at Muscle & Fitness and executive writer at Men's Health, where he remains a contributing editor. His feature writing has been cited in both the Best American Sports Writing and Best American Science and Nature Writing anthologies. He has coauthored four books, including Mario Lopez's Knockout Fitness and LL Cool J's Platinum Workout, which became a New York Times bestseller.