Gant, 53, joined BBDO/Chicago as creative director in 1983, and has overseen creative for Bayer Corporation, Allied Domecq and the Wm. Wrigley, Jr. Company. Wrigley, as we noted last year, has undergone a creative rebirth under Gant. (Creativity March 2002.) Gant starts work in the Detroit office on Monday. Meanwhile, former Merkley Newman Harty ECD Marty Orzio, 46, has been tapped to replace Gant in Chicago.