The head of sales for the Minneapolis Star Tribune, Michael LaBonia (left), is replacing Phyllis Pfeiffer (right) as senior vice president of advertising at the Chronicle, the paper announced today. Pfeiffer is joining the advertising staff of Hearst Newspapers. LaBonia is quitting the Star Tribune, which has been mired in controversy after its publisher, Par Ridder, was accused by Dean Singleton of taking computer data and violating non-compete agreements when he left the rival St. Paul Pioneer Press. The Pioneer Press is operated by Singleton’s MediaNews and owned by Hearst.