Julian Flowers is a Consultant in Public Health Medicine at Public Health England and Honorary Professor at University College London, where he is helping develop the Centre for Public Health Data Science as part of the Institute for Health Informatics. At Public Health England he leads the recently established Public Health Data Science team. He has a long standing interest in health intelligence, having established one of the regional public health observatories in England and an equivalent NHS observatory. He now leads part of PHE's work on developing precision public health combining data science, marketing and digital inputs to make best use of routine and digital data to devise interventions to improve population health.