He declined to detail the reasons for his departure, which leaves the Santa Monica, Calif., agency without its chief creative officer. Colby plans to open a new shop focused on Internet advertising and local clients.
Colby launched a shop called Larsen Colby in 1984. He soon partnered with New York-based creative director George Lois and the agency went through various name changes before Colby left in 1997 to run the Lord Dentsu shop in Santa Monica. After a year as Colby Effler, the company was rechristened Colby & Partners.