Ulrike Hahn is a professor at the Department of Psychological Sciences at Birkbeck College, University of London, where she also serves as director of the Centre for Cognition, Computation and Modelling. Ulrike Hahn’s main focus has been on questions of human rationality. Her research examines human judgment, decision-making, and the rationality of everyday argument. In recent years she has been particularly interested in the role of perceived source reliability for our beliefs, including our beliefs as parts of larger communicative social networks. She has also been trying to apply research insights from this domain to improving science and science communication during the pandemic. Ulrike Hahn has been a member of the Senior Editorial Board of Topics in Cognitive Science, an Action Editor for Psychonomic Bulletin & Review, and is currently serving as an Action Editor for Cognitive Psychology, and a consulting editor for Psychological Review. She was awarded the Cognitive Section Prize by the British Psychological Society, the Kerstin Hesselgren Professorship by the Swedish Research Council, and the Anneliese Maier Research Award by the Alexander von Humboldt Foundation. She is a fellow of the German National Academy of Science (Leopoldina) and a fellow of the APS, and received an honorary doctorate from Lund University, Sweden in 2017.