The Power List 2016
Professor of Ophthalmology at the Institute of Ophthalmology, University College London, London
John Marshall invented and patented the Excimer laser, and today more than 35 million laser vision correction procedures have been performed worldwide. He created the world’s first Diode laser for treating the eye problems of diabetes, glaucoma and aging. Over the past 40 years he has held posts chairing the medical advisory boards of many international companies, holds many academic positions across a great number of top academic institutions, and has worked on many national and international committees concerned with protecting the public against the possible damaging effects of lasers and other artificial light sources – perhaps most notably, addressing the United Nations to obtain a Geneva Convention banning the use of anti-personnel laser weapons.