1. Clinical Assistant Professor, Department of Restorative Dentistry, University of Pennsylvania, School of Dental Medicine, Philadelphia, PA.
2. Instructor in Restorative Dentistry and Biomaterials. From University of Texas Health Science Center at Houston, Dental Branch, Houston, TX.
3. Professor, Department of Restorative Dentistry and Biomaterials, and Director, Houston Biomaterials Research Center. From University of Texas Health Science Center at Houston, Dental Branch, Houston, TX.