Robert Manning was named chief executive officer, president and chief investment officer of MFS Investment Management, Boston. He had been chief fixed-income officer. Mr. Manning assumed his new job following a settlement between MFS and regulators over mutual fund market-timing and trading issues. Mr. Manning replaces former CEO John Ballen, who agreed to a nine-month suspension from the securities industry as part of a settlement with the Securities and Exchange Commission, and former President and CIO Kevin Parke, who agreed to a six-month suspension. Michael W. Roberge, director of fixed-income research, will become chief fixed-income officer as well.