Charles Wibbelsman, MD, is an award-winning author and former "Dear Doctor" columnist for "TEEN" magazine. Wibbelsman is Chairman of the chiefs of adolescent medicine for the Permanente Medical Group of Northern California, chief of the Teenage Clinic at Kaiser Permanente San Francisco, and an associate professor of pediatrics at the University of California, San Francisco Medical School. He appears regularly on Parenting and Psychology on BAY-TV in San Francisco and is an online expert for the National Parenting Center.