Gwyn Samuel Williams qualified from medical school at King's College London and completed his ophthalmology training on the Wales circuit. He recently completed a year's fellowship in medical retina and uveitis at Moorfields Eye Hospital in London. From June 2016 onwards he has been a Consultant in Swansea specialising in medical retina and inflammatory eye disease. He has a keen interest in reading, writing and hiking through the beautiful Welsh countryside.

Mark Westcott is a Consultant Ophthalmologist at Moorfields Eye Hospital, where he specialises in uveitis, and at St Bartholomew's and The Royal London Hospitals in London. After residency training in London he spent a Fellowship year in glaucoma at the UCLA Stein Eye Institute, Los Angeles. Thereafter, he returned to Moorfields Eye Hospital to undertake a Specialist Fellowship in medical retina and inflammatory eye disease. Mark has co-authored over 40 scientific papers, and regularly lectures both nationally and internationally. He is an honorary Senior Lecturer at the Institute of Ophthalmology, UCL. His research interests include infectious uveitis, birdshot disease and visual dysfunction in glaucoma. Mark lives in London with his family, and in his spare time he indulges a passion for amateur astronomy and coaches junior rugby.