Dr. David G. Harper is a health educator and cancer researcher. He is an Associate Professor of Kinesiology at the University of the Fraser Valley and a Visiting Scientist at the BC Cancer Research centre, Terry Fox Laboratory. He holds a Ph.D. from the University of British Columbia and completed a post-doctoral fellowship at the University of Cambridge in Comparative Physiology.

He is on the Scientific Advisory Board of the Institute for Personalized Therapeutic Nutrition and was previously the co-host of the radio program Think For Yourself, a current affairs show about healthy skepticism and critical reasoning.

He has been following the BioDiet  for six years after quickly losing 27 pounds of body fat and now has a biological age about half his chronological age. As part of his research, he has counseled hundreds of people, helping them reverse obesity and chronic disease with consistent, impressive results.