Sohan Singh HAYREH, MD, PhD (London), DSc (London), FRCS (England, FRCS (Edinburgh), FRCOphth (Honorary) is Professor Emeritus of Ophthalmology and Director of the Ocular Vascular Clinic at the Department of Ophthalmology and Visual Sciences at the College of Medicine, University of Iowa City, USA. Professor Hayreh has done basic, experimental and clinical research on various aspects of ischemic optic neuropathy since 1955, and more than 90% of the seminal information on ischemic optic neuropathy is based on his studies. In 1975 he published the book Anterior Ischemic Optic Neuropathy with Springer. Since then he has done a tremendous amount of clinical (in more than 1500 patients) and basic research on the subject of Ischemic Optic Neuropathy. Professor Hayreh furthermore published a fair amount of his work in Graefe’s Archive of Clinical and Experimental Ophthalmology and is a frequent reviewer of papers for the journal.