The College of Wooster is launching two presidential searches: one for an interim leader and another to find a permanent replacement for Grant H. Cornwell.The board of trustees made the announcement Saturday.The interim leader will head the private school during the 2015-16 academic year, with the hope that a new president is in place early next year.Cornwell surprised the liberal arts college and board last month by announcing that he’s leaving to become president of Rollins College in Winter Park, Fla., on July 1.