David Marin, formerly head of advertsing at Santa Maria Times, will take over in the same position at the Gilroy Dispatch, Morgan Hill Times and Hollister Free Lance. The three papers south of San Jose are owned by Mainstreet Media. Marin, 47, will work out of the Dispatch offices in Gilroy. Prior to Santa Maria, Marin worked in advertising at the Rocky Mountain News in Denver and the Monterey County Herald. While in Monterey, he also found time to earn a law degree.