Postdoctoral Associate, Department of Internal Medicine, Section of Endocrinology,Yale University School of Medicine. Honorary Research Fellow, UCL Institute of Ophthalmology.

Assistant Professor of Optometry, University of West Attica, Athens, Greece. Associate Professor (Hon) UCL Institute of Ophthalmology & Moorfields Eye Hospital NHS Foundation Trust.

Professor of Ophthalmology, University of Sydney. Director of Glaucoma Services, Westmead Hospital, Australia

Professor and John R and Hazel M Robertson Presidential Endowed Chair, Department of Ophthalmology and Visual Sciences, University of Utah.

Professor of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine

Professor and Canada Research Chair, Department of Neuroscience, Department of Ophthalmology , University of Montreal Montreal, Quebec, Canada

Professor of Ophthalmology, Vogt Endowed Chair, Hamilton Glaucoma Center, Viterbi Family Department of Ophthalmology, Shiley Eye Institute, University of California, San Diego

Research Director. Glaucoma Center of San Francisco