Michael D. Lewis, MD, MPH, MBA, FACPM, FACN, is an expert on nutritional interventions for brain health, particularly the prevention and rehabilitation of brain injury. In 2012, upon retiring as a colonel after 31 years in the US Army, he founded the nonprofit Brain Health Education and Research Institute. He is a graduate of the US Military Academy at West Point and Tulane University School of Medicine. Dr. Lewis is board-certified and a Fellow of the American College of Preventive Medicine and American College of Nutrition. He completed post-graduate training at Walter Reed Army Medical Center, Johns Hopkins University, and Walter Reed Army Institute of Research. He is in private practice in Potomac, MD, and is the author of When Brains Collide: What Every Athlete and Parent Should Know About the Prevention and Treatment of Concussions and Head Injuries.