Prof. Dr. Michael F Holick, Ph.D., M.D. is an internationally recognized expert in the field of vitamin D, skin, collagen, and bone research. He is a Professor of Medicine, Physiology, and Biophysics and Molecular Medicine and the Director of the Vitamin D, Skin, and Bone Research Laboratory at the Boston University School of Medicine. He is also the Director of the Ehlers Danlos Clinical Research Program at the Boston University School of Medicine. Over the past five decades, he has made major contributions in the areas of vitamin D, skin disease, hair research, cancer research, metabolic bone disease, evolutionary biology, and disorders of collagen metabolism and calcium metabolism. He has published over 800 journal articles, book chapters, editorials, and proceedings. He has written and edited 13 books, including his most recent bestseller, The Vitamin D Solution. There have been more than 150,000 citations for his research activities on Google Scholar. He served as the Chair for the Endocrine Society’s Clinical Practice Guidelines Committee for Vitamin D, which published recommendations for how to treat and prevent vitamin D deficiency in children and adults. He served in various capacities, including being the chair for NASA’s Research Committee on Human Health and Performance for the bone health of astronauts over the past 35 years. He has received numerous awards for his research activities.