Bill Fergusson will be senior vice president and director of marketing at Managers Funds as part of Boston-based Affiliated Managers Group's announced acquisition of Fremont Investment Advisors, San Francisco. He held the same position at Fremont. Jim Klescewski, who was senior vice president and chief financial officer at Fremont, will join Managers to oversee compliance, human resources and IT, said Patricia Harden, Fremont spokeswoman. His title has not yet been determined. Managers will open an office in San Francisco.