Dr Krell qualified in medicine at Leeds University Medical School, where he also gained a Bachelor’s degree in microbiology and immunology. He completed his junior doctor training at Guys and St. Thomas’ Hospitals and University College Hospital before undertaking his oncology training at The Royal Free and University College Hospitals in London. Dr Krell’s DPhil research was undertaken at Oxford University, at the Wellcome Trust Centre for Human Genetics. Dr Krell’s research investigated the role that genetic mutations in genes controlling cellular metabolism play in the development of cancer, with the aim of identifying new therapeutic targets in this area. He continues to be involved in clinical research and clinical trials aimed at identifying new cancer therapies, with a focus on gastrointestinal and hepatobiliary cancers. Dr Krell has published several peer-reviewed papers in journals such as the British Journal of Cancer and Lancet Oncology. His clinical work focuses on the management of patients with gastric, oesophageal, colorectal, pancreatic, liver and biliary tract cancers using chemotherapy, targeted therapy and immunotherapies. He also manages patients with cancer of unknown primary and is the clinical lead at his institution for this. He also acts as the clinical lead for gastro-oesophageal and hepatobiliary cancer.