Prof Shennan runs Tommy's premature birth clinic at St Thomas’ Hospital, where he also manages the clinical trials unit in their Women’s Academic Health Centre and oversees the wider NHS Trust’s research and development, as well as teaching obstetrics at King's College London. He developed the QUIPP app to predict and prevent premature birth (currently used in Tommy's specialist clinics with a view to being made available across the NHS) and won the 2017 Newton Prize for his life-saving blood pressure monitoring CRADLE device. As well as his expertise in premature birth, his research portfolio includes pregnancy complications related to blood pressure such as pre-eclampsia, and he has published more than 200 peer-reviewed papers. He chairs the National Institute for Health Research’s reproductive health and childbirth group, and sits on the academic and research committees of the Royal College of Obstetrics & Gynaecology. In 2018, he was made an OBE (Officer of the Order for the British Empire) for his tireless work in maternity services.