O’Connor to lead U.S. institutional at Pioneer

John F. O’Connor was named executive vice president and head of U.S. institutional business at Pioneer Investments. The position is new. Mr. O’Connor was senior vice president and director of North American sales and consultant relations with MFS Investment Management, according to a Pioneer news release. Christopher Callahan, a vice president of institutional sales at MFS, assumed Mr. O’Connor’s responsibilities and was named director of North American sales and relationship management.