I am a physician and vitamin D expert. I am a graduate of the University of North Carolina School of Medicine. In my 35 year career in medicine, I have practiced emergency medicine, general practice and psychiatry. In 2003, I established the Vitamin D Council, a non-profit dedicated to educating the public and health professionals about vitamin D. I frequently speak about vitamin D and have spoken at the annual meeting of the American Association for the Advancement of Science. I recently served as a "visiting professor" for Marshall University School of Medicine's 25th Annual Research Day. I have been studying, writing and lecturing about vitamin D for more than 12 years. The Vitamin D Council's website gets over 2.5 million users per year. If you Google my name, "John Cannell", you will get over 60,000 hits, almost all about vitamin D. If you search for "Cannell JJ" on Google Scholar, you will see I have written more than a dozen peer-reviewed scientific articles about vitamin D. Three of my scientific articles (two about influenza and vitamin D and one about autism and vitamin D) are the most cited articles in the history of their respective journals.