A former Temple University, city and school district executive has been named interim president of Girard College, officials announced Friday.Clarence "Clay" D. Armbrister, 55, will take the helm at the private boarding school in North Philadelphia on July 1. Mayor Nutter's former chief of staff, Armbrister most recently was senior vice president and chief of staff at Johns Hopkins University in Baltimore, a post he left after six months. Armbrister, who had a long commute, said he left Johns Hopkins "to fulfill my family obligations."