University of Tennessee, USA.
- Profesor, Department of Bioscience Research, Director, Bioscience Research Center y Director of the Clinical Research Center. Fué Senior Executive Associate Dean for Research y Chair, Department of Bioscience Research, College of Dentistry, University of Tennessee Health Science Center, Memphis, Tennessee, del 2009 al 2018.
- Adjunct Professor, The Forsyth Institute, Cambridge, Massachusetts, USA y Profesor de Investigación Adjunto en el Departmento de Ingenieria Biomédica de la Universidad de Memphis, Memphis, Tennessee.
- Profesor de Investigación Adjunto del Department for Conservative Dentistry (Restorative and Endodontics), Periodontology and Pediatric Dentistry, University of Munich, Munich, Germany.
- Profesor Adjunto, Department of Surgery, Herbert Wertheim College of Medicine, Florida International University, Miami, Florida, USA.
- Profesor Honorario de la Universidad Autónoma de Santo Domingo.
- Editor de la revista American Journal of Dentistry y Editor Asociado de la revista Stem Cells and Development y Editor Asociado de la revista Journal of Dentistry.
- Ha publicado más de 610 artículos científicos.
