AllianceBernstein Names Onur Erzan CEO as Seth Bernstein Retires

By Colin KellaherAllianceBernstein Holding's chief executive, Seth Bernstein, is retiring early next year after a decade at the helm of the investment manager.AllianceBernstein on Friday said Onur Erzan, who became president of the Nashville, Tenn., company in January, will take on the additional p…