- Graduated University College Dublin 2005
- Specialist Registrar in Radiology in Cork University Hospital and Mercy University Hospital 2008-2012
- Fellowship in MRI and PET/CT, St. James Hospital, Dublin 2012-2013
- Fellowship in MRI, Northwestern University Feinberg School of Medicine, Chicago, IL, USA 2013-2014
- Fellowship in Musculoskeletal Radiology, University of Toronto, ON, Canada 2014-2015.
Oisin is appointed as musculoskeletal radiologist with specialist training including NFL, NHL, NBA, MLB and MLS athletes in the United States and Canada. He is a Radiology lecturer in the Faculty of Radiologists in Ireland and has previously been a Radiology Lecturer in Trinity College Dublin and the Ontario Association of Radiology, ON, Canada.