United Nations Joint Staff Pension Fund, New York, is searching for an international equity portfolio manager who will be part of a team of four covering Asia, Australia, Europe and emerging markets. The exact assignment hasnt been determined yet, but the new portfolio manager could cover Asia, said Henry L. Ouma, director-investment management service. The person would replace an international portfolio manager who left. Mr. Ouma declined to provide details. The $21.8 billion plan has 23% assets invested in non-U.S.-dollar equities, all but about 3% is internally managed.