Peter Sasieni is Academic Director of King's Clinical Trials Unit and Professor of Cancer Prevention. He leads the cancer prevention group which takes a population perspective to research on cancer screening, early detection, and prevention. The group has sub-teams in behavioural sciences, clinical trials, experimental epidemiology, observational epidemiology and statistics.

Prof Sasieni read mathematics at Cambridge University and a PhD in biostatistics from the University of Washington. He did his post-doctoral training at the Imperial Cancer Research Fund (later Cancer Research UK (CRUK)) in Jack Cuzick's group. The group moved to the Wolfson Institute of Preventive Medicine at Queen Mary University of London where Sasieni became Professor of Cancer Epidemiology & Biostatistics. He joined KCL in 2017. Sasieni has a CRUK programme grant in cancer screening and statistics, is Director of the CRUK KCL Cancer Prevention Trials Unit, and Vice Director of the NIHR Policy Research Unit on Cancer, Awareness, Screening and Early Diagnosis.