Donna Hayes will take over as president of Harlequin Enterprises at the end of the year following the early retirement of Brian Hickey, currently CEO. Hickey is leaving Harlequin on December 30. A 16-year veteran of Harlequin, Hayes has been involved in all aspects of the company's business. Among her achievements was development of Harlequin's single-title business, which accounts for about 25% of the publisher's revenues.