Gwyn Samuel Williams qualified from a medical school at King's College London and completed his ophthalmology training on the Wales circuit. He completed a year's fellowship in medical retina and uveitis at Moorfields Eye Hospital in London and from June 2016 onwards he has been a consultant in Swansea specialising in medical retina and inflammatory eye disease. He is an honorary Associate Professor at Swansea University and from 2020-2023 was Llywydd of the RCOphth in Wales and Clinical Lead for Ophthalmology to the Welsh Government. He has a keen interest in reading, writing and hiking through the beautiful Welsh countryside, and was Plaid Cymru's candidate for the 2019 and 2024 elections in his constituency of Swansea West.

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 70 peer-reviewed scientific papers, and regularly lectures both nationally and internationally. He is a Visiting Adjunct Professor at the University of Pittsburgh and honorary Reader, Queen Mary University of London. He is a member of the International Uveitis Study Group. 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 in a passion for amateur astronomy.