Boston--Walter Manninen has been appointed president of IDG Corp.'s CXO Media, publisher of CIO and CSO magazines. He succeeds Joe Levy, CEO and founder of CXO Media, who announced his retirement. The move comes less than a week after IDG named Pat Kenealy president-CEO of IDG. Kenealy succeeded industry veteran Kelly Conlin. Manninen has been with CXO for 11 years, most recently as exec VP-operations.