Peter Hoskin has extensive clinical experience in the use of modern techniques for radiotherapy delivery. He undertakes both national and international teaching courses in the subject and is a clinical lead for the National Cancer Research Institute (NCRI) radiotherapy quality assurance programme. An experienced teacher and examiner in clinical oncology, he currently chairs the fellowship Examination Board for the Royal College of Radiologists. Peter Hoskin is the series editor for the Radiotherapy in Practice series. Thankamma Ajithkumar is a Consultant Clinical Oncologist at Addenbrooke's Hospital. He undertook a research fellowship in the Royal Marsden Hospital, London followed by speciality training in Clinical Oncology in the Eastern Deanery before becoming a Consultant Clinical Oncologist at the Bristol Haematology and Oncology Centre in 2006. In 2009 he moved to Norfolk and Norwich University Hospitals, subsequently moving to Cambridge in 2014. His research interest is to optimize the combination of radiotherapy with novel agents in paediatric brain tumours and hepato-pancreatico-biliary tumours to improve clinical outcomes. He is Chair of the European Society of Paediatric Oncology (SIOPE) Brain Tumour Radiotherapy group, and the principal investigator for the international Pediatric Normal Tissue Effects in the Clinic (PENTEC) Re-irradiation working group. He is also the radiotherapy lead for the CCLG CNS GCT subgroup and the radiotherapy research lead for the Cancer Research Network: Eastern. Vicky Goh is the Chair and Head of Department of Cancer Imaging at the School of Biomedical Engineering and Imaging Sciences, King's College London and Honorary Consultant Radiologist at Guy's and St Thomas' Hospitals, London. Her research is focused on functional imaging in cancer with CT, MRI and PET/MRI; tumour heterogeneity and AI. She has a special interest in gastrointestinal and genitourinary.