7 Keys to a Long Life with 100 Year Old Dr. John Scharffenberg & Doug Batchelor John Scharffenberg, M.D. is a physician, nutritionist and Professor of Nutrition at Loma Linda University, a graduate of Harvard University's School of Public Health. Director of the Pacific Health Education Center, Bakersfield, California. A special interest in the world of health as is relates to your health and longevity.