University of Alabama at Birmingham

University of Alabama at Birmingham, University of Houston, Ohio State University

Professor, Eye-ACP, Duke-National University of Singapore Medical School, Singapore

Schepens Eye Research Institute, Mass Eye and Ear, Harvard Medical School

Prof. Dr. med., Ocular Surface Center Berlin (OSCB), Dept. for Anatomy, Charité

Department of Ophthalmology, Keio University School of Medicine

Zhongnan Hospital, Wuhan University

Alcon Laboratories

University of Waterloo

Private practice