Stephen Ardizzoni was named head of global research by hedge fund-of-funds manager Union Bancaire Privees UBP Asset Management unit. He joined UBPAM at the beginning of the year as strategy head of credit and event-driven investments, said spokesman Armel Leslie. Based in New York, Mr. Ardizzoni replaces Stefan Zellmer, who led UBPAMs alternative investment research business for 2½ half years. Mr. Zellmers plans could not be learned. Edgar Nehme, a member of the event-driven/credit team, replaced Mr. Ardizzoni as head of the strategy, said Mr. Leslie.