John Morrison will become CEO of Man Investments on Aug. 31, replacing Chris Chambers, who is leaving the London-based hedge fund-of-funds company. Mr. Chambers' plans could not be learned by press time. Mr. Chambers had been at Man since March 2002, according to a statement from the company. Mr. Morrison is currently head of marketing and clients services at Man Investments. A decision on replacing Mr. Morrison has not been made, said Paul Lockstone, a spokesman for Man Group.