New York University

Department for Reconstructive Dentistry and Gerodontology, School of Dental Medicine …

Université Laval, Faculté de médecine dentaire

Universidade Federal do Rio Grande do Sul

University of florida

Professor Emeritus, Temple University, Adjunct Professor, Midwestern University

Clinic of General, Special care, and Geriatric Dentistry, University of Zurich

Professor and Chair, University of Iowa

Department of Dentistry, School of Medicine, Fujita Health University

Professor, National & Kapodistrian University of Athens, School of Dentistry