Prof Seamus O’Reilly BSc MD PhD FRCPI is Consultant Medical Oncologist at Cork-Mercy and South Infirmary Victoria University Hospitals, Clinical Lead at Cancer Trials Ireland, and Clinical Professor at University College Cork. A graduate of University College Galway (BSc, MB BCh BAO, MD) he completed basic specialist training at Trinity College Dublin affiliated hospitals and  medical oncology training at John Hopkins Hospital, Baltimore, MD where he was subsequently Assistant Professor in Medical Oncology. During fellowship training there he completed a PhD in Clinical Investigation and focused on Cancer Pharmacology in his research. He is a founding trustee of the South Eastern Cancer Foundation and Cork ARC Cancer Support House and was National Specialty Director in Medical Oncology at the Royal College of Physicians in Ireland from 2013-2021 mentoring projects on litigation in breast cancer, climate change, rare tumour management, survivorship, pharmaco-economics, dental oncology, cyber security and the impacts of the COVID-19 pandemic on healthcare staff and patients.

At Cancer Trials Ireland he founded the National Green Cancer Clinical Trials Initiative in 2022, and is a member of the Executive Board of the Breast International Group (2021-5), The National Research Ethics Committee, Advisory Board of the National Cancer Registry, and the steering committee of the All Ireland Cancer Research Institute, and The European Society of Medical Oncology Climate Change Taskforce, and Oncology Pro Group. He is deputy editor of British Journal of Cancer Reports. His main research focus are clinical trials in breast cancer, sustainability in healthcare, and survivorship. He is a member of the ESMO Climate Change Task Force.