1. Clinical Associate, Division of Orthodontics and Dentofacial Orthopedics, American University of Beirut Medical Center, Beirut, Lebanon.
2. Professor and Head, Division of Orthodontics and Dentofacial Orthopedics, American University of Beirut Medical Center, Beirut, Lebanon; Professor, Department of Orthodontics, School of Dentistry, Lebanese University, Beirut, Lebanon; Visiting Scholar, Department of Orthodontics, College of Dentistry, New York University, New York, NY; Adjunct Professor, Department of Orthodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pa.