Detroit—Crain’s Detroit Business announced Monday that Mary Kramer has been named publisher, succeeding founding publisher Keith Crain, who assumes the title editor in chief. Crain is chairman of Detroit-based Crain Communications Inc., which publishes BtoB. Christopher Crain was named associate publisher, effective June 20. He will report to Kramer. Christopher Crain is moving to Detroit from New York, where he was interactive sales manager for Crain Communications’ Business Insurance.