William Poutsiaka today was appointed president and CEO of PanAgora Asset Management, and Edgar Peters was named CIO. Mr. Poutsiaka, who was president and CEO of Arkwright Mutual Insurance, replaces Bruce Clarke, who has resigned. Mr. Peters, currently PanAgoras chief investment strategist, replaces Peter Rathjens. It was not known why the two left; Messrs. Clarke and Rathjens could not be reached for comment. A release from the firm said the two will be staying for a transitional period.