Harriet Hall, M.D., a retired family physician and colonel, served 20 years in the U.S. Air Force. Her administrative positions included Chief of Clinic Services and Director of Base Medical Services. She now devotes her time to investigating questionable health claims and writing and lecturing about pseudoscience, quackery, "alternative medicine," and critical thinking. She is a contributing editor to bothSkeptical InquirerandSkepticmagazines and a founding member and editor of the Science-Based Medicine blog.