Larry Nassar, a doctor to Olympians who was convicted of possessing child pornography and of molesting more than 200 women and girls, has been transferred to a maximum-security prison.

He was transferred on Thursday from the Eaton County Jail in Michigan to the Milan Federal Correctional Institution, which is near Ann Arbor. As of Saturday he has been housed in at a prison in Tucson, Ariz., according to information on the website of the Federal Bureau of Prisons.