Denis started his tenure at Beachbody in 2002, answering customer fitness and nutrition questions and writing articles for the company newsletter. Over 16 years, he worked his way up to Executive Director of Nutrition Content. He co-wrote Tony Horton's book The Big Picture and co-created several Beachbody nutrition plans, including P90, P90X2, P90X3, Body Beast, PiYo, FOCUS T25, 21 Day Fix, 21 Day Fix EXTREME, CORE DE FORCE, SHIFT SHOP, LIIFT4, and 2B Mindset.

Before Beachbody, he worked as a professional journalist, writing for publications including The New York Times, Outside, Wired, Surfer, Los Angeles Times, and Men's Journal. He did his undergraduate work at UCSB and holds a Masters of Science in Holistic Nutrition from Hawthorn University.

Formerly weight challenged"