Dallas Hartwig co-founded Whole9 in 2009. He is a functional medicine practitioner, Certified Sports Nutritionist, and licensed physical therapist who specializes in treating lifestyle-related hormonal, digestive, and metabolic health issues. He is the New York Times bestselling co-author of The Whole30 and It Starts With Food. In 2012, he founded his functional medicine practice, mentoring under Dr. Daniel Kalish and enrolling in the Institute for Functional Medicine‘s certification program. Dallas is on the Advisory Board for Paleo f(x) and Fitwall, and on the Board of Editors and Reviewers for the International Journal of Human Nutrition and Functional Medicine.