WP Stewart & Co, the New York based asset manager, has appointed Mark Bergen as managing director - chief financial officer and chief operating officer with immediate effect.

Bergen is from Angelo, Gordon & Co where he served as COO and CFO for the firm's AG Asset Management unit. Prior to that, he held senior roles at UBS Global Asset Management, Goldman Sachs & Co, and UBS Investment Bank.

In his new role, Bergen will also be part of WP Stewart's managing committee, which includes Mark Phelps, the company's chief executive officer and president, and James Tierney, the chief investment officer and senior vice president for US equity research and portfolio management.

The company also announced that Rocco Macri, the present managing director - COO, will be leaving today. Susan Leber, the managing director - CFO, will also be leaving after a short transition period of a few months.