David Marin, formerly vice president of advertising for the Pulitzer Newspapers’ Santa Maria Times, is the new ad director for Main Street Media, the company that includes the Gilroy Dispatch, Morgan Hill Times and Hollister Free Lance. Marin, 47, has also worked at the Rocky Mountain News in Denver and the Monterey Hearld. He replaces Andy Bruns, who left Mainstreet Media in April to become publisher of The Daily American in Somerset, Pa.