Aetna has named Karen Rohan as its president, the insurer announced Monday. The appointment, effective Jan. 1, 2015, positions her as a potential successor to Aetna CEO and Chairman Mark Bertolini. Rohan had been an executive vice president of Aetna's local and regional business; the new role also includes national and government segments. Rohan came to Aetna from Magellan Health Services in 2012 and also served as an executive at Cigna. Announcement