Professor Nicholas van As MBBCH MRCP FRCR MD(res) Consultant Clinical Oncologist and Medical Director of The Royal Marsden and Professor of The Institute of Cancer Research Professor Nicholas van As was appointed Medical Director of The Royal Marsden NHS Foundation Trust in January 2016. He has been a Consultant Clinical Oncologist in the Urology Unit at The Royal Marsden since 2008 and is the hospital’s Clinical Lead for stereotactic body radiotherapy (SBRT) and CyberKnife. Nicholas is also a Professor of The Institute of Cancer Research. Professor van As was previously Chair of the UK SBRT Consortium and is the national clinical lead for NHS England’s Commissioning through Evaluation Programme for SBRT. His main research interests are in stereotactic and image-guided radiotherapy, risk prediction in early prostate cancer, and functional MRI, and he has published numerous papers on these subjects and delivered presentations at international meetings. He is the Chief Investigator for the PACE trial – an international, randomised controlled trial comparing SBRT to image-guided radiotherapy (IGRT) and surgery for treating prostate cancer.