UCD Clinical Professor, University College Dublin
Consultant Vitreo-Retinal Surgeon and Head of Department at the Mater Misericordiae University Hospital.
Honorary Consultant Vitreo-retinal surgeon at Temple Street Childrens hospital.
National Clinical Lead for Diabetic Retinopathy Screening, National Screening Service, NSS, Dublin.
Chair of Low Vision Working Group, European Reference Network (ERN) for Rare Eye Disease

Mr Keegan is a graduate of the Royal College of Surgeons in Ireland (RCSI) qualifying in 1994.
He attained his PhD from Institute of Ophthalmology / University College London (Retinal Transplantation supervised by Ray Lund). He continued his work on retinal transplantation concentrating on the role of the innate immune system in sub-retinal transplant loss.
He completed his Basic and Higher Surgical Training at Moorfield’s Eye Hospital, London (1997-2005) and followed that with a Fellowship in Complex Vitreo-retinal Surgery Columbia University / New York Presbyterian Hospital, New York, USA (2005-2006) with Dr Stanley Chang.

In 2013 Mr Keegan was appointed National Clinical Lead for the Diabetic Retinopathy Screening Programme which is a new, government-funded screening programme in Ireland that offers free, regular diabetic retinopathy screening  to people with diabetes aged 12 years and older.

He  also runs the Mater Inherited Retinal Degeneration and Diabetic Retinal Treatment Services along with the Retinal Clinical Trials Unit.
Trials include the development of the injectable intraocular telescope with VisionCareTM.

Mr Keegan serves on the Board of both the National Council of the Blind Ireland and Fighting Blindness Ireland.

He Chairs the Low Vision Working Group and sits on the co-ordinating committee of the European Reference Network for Rare Eye Disease group (ERN-EYE).