Christopher Wilson was named head of mutual funds at Columbia Management, effective this week, said Donya Hengehold, spokeswoman. He will oversee the Nations, Columbia and Columbia Acorn Funds families of funds. He replaced Kevin Connaughton, who was named head of fund administration oversight, fund compliance and fund accounting. Mr. Wilson was president and CEO of CDC IXIS Asset Management Services, which he launched in 1998, Ms. Hengehold said. Crystal Sullivan, CDC IXIS spokeswoman, said the firm doesn't comment on employee matters.