Ken Ross now is commissioner of the Michigan Office of Financial and Insurance Services.
Ross succeeds Linda Watters, who left the post in October 2007 to take a job in the Chicago office of KPMG L.L.P., an accounting firm.
Watters had been the Michigan insurance commissioner since April 2003.
Ross, who has been the acting Michigan commissioner since Watters resigned, previously was deputy commissioner for policy at OFIS.