The charismatic head of health information technology at the Department of Health and Human Services will step down this fall. In an e-mail to staff, Dr. Farzad Mostashari didn't divulge why he was departing after serving for two years in that position and four years at the agency. "It is difficult for me to announce that I am leaving. I don't know what I will be doing after I leave public service, but be assured that I will be by your side as we continue to battle for healthcare transformation," Mostashari wrote in an email to the staff of the Office of the National Coordinator for Health Information Technology.