The Rev. Jean-Bertrand Aristide, exiled president of Haiti, will be a guest tonight on the Marc Steiner show on WJHU-FM (88.1). Mr. Steiner's taped interview with Father Aristide airs from 7 p.m. to 7:30 p.m., followed by a panel discussion involving Baltimore author Taylor Branch, political activist Randall Robinson and Johns Hopkins University Professor Michel Rolphe Trouillot.