Greg Hahn, currently a creative director at Fallon's L.A. outpost, will join BBDO/N.Y. in mid-March as an executive creative director, the agency announced today. Hahn will report to former Fallonite and current BBDO CCO David Lubars. ... Managing partner Chris Lloyd has been named president of DDB/Seattle, replacing Ron Elgin, who has been named chairman and CEO. ... Freelance producer Cheri Anderson has joined New York's Believe Media as executive producer. ... Roe Bressan, managing director of the Whitehouse/N.Y., will leave the company later this month to launch her own consulting business, which will count the Whitehouse as a client.