Mark graduated at the Royal College of Surgeons and his ophthalmology and senior registrar training took place in Ireland.
He has completed three fellowships:
- Oculoplastic Fellowship at Westminster Hospitals, London
- Cornea and Refractive Fellowship at Toronto Western Hospital
- Glaucoma Fellowship at Academic Centre, Amsterdam
He was appointed Consultant Ophthalmic in Ocular Plastic in UK 2001 and Consultant Ophthalmic in Ocular Plastic in Waterford Regional Hospital 2003.
Mark has a full time private practice at UPMC Whitfield Hospital and Ely Hospital, Wexford since July 2013.