1. Private Practice, McKinney, TX, USA.
2. Professor Emeritus, Department of Orthodontics, Texas A&M University College of Dentistry, Dallas, TX, USA.
3. Associate Professor and Head, Department of Orthodontics, Texas A&M University College of Dentistry, Dallas, TX, USA.
4. Professor, Department of Biomedical Sciences, Texas A&M University College of Dentistry, Dallas, TX, USA.
5. Regents Professor and Director of Orthodontic Research, Department of Orthodontics, Texas A&M University College of Dentistry, Dallas, TX, USA.