BOSTON (AP) — The head of an exclusive Massachusetts prep school says the former medical director was reprimanded for using a school computer to access adult pornography, one of the many reasons he was not rehired.

But Phillips Academy's John Palfrey stressed in a Friday email that the academy's concerns with Dr. Richard Keller are unrelated to a federal child pornography case against him. Palfrey said he does not believe any of the students were the subject of Keller's alleged crime.

Keller is in custody and has a Monday bail hearing. Both Children's Hospital in Boston and Harvard Medical School, where he also works, say they have placed him on leave.

Phillips Academy in Andover is one of the nation's most selective prep schools and alumni include both presidents Bush, Jack Lemmon and Humphrey Bogart.