CONWAY — The founder and editor of The Oxford American is no longer employed by the award-winning magazine, the publisher said Monday.Warwick Sabin confirmed the departure of editor Marc Smirnoff and another editorial employee, Carol Ann Fitzgerald, from the literary magazine. Citing personnel matters, Sabin declined to give a reason for their departures.The developments follow Sabin’s decision to have employees locked out of the magazines editorial offices at the University of Central Arkansas on Wednesday night. He said later that a personnel investigation was under way.