Frank Kelly is Emeritus Professor of the Mathematics of Systems at the University of Cambridge. He is the chair of the new report released by the Royal Society on the online information environment, which discusses the challenge of scientific misinformation and how we can foster a healthier online information environment. Kelly’s main research interests are in random processes, networks and optimization. He is especially interested in applications to the design and control of networks and to the understanding of self-regulation in large-scale systems. He was elected a Fellow of the Royal Society in 1989. From 2003 to 2006, he served as Chief Scientific Adviser to the UK Government’s Department for Transport.