On the 11th of February Denis Hilton passed away. He was a great cognitive psychologist who made important advancements in social cognition, decision making and behavioral finance. The Hilton-Slugoski model of causal attribution is considered one of the main pillars of causal reasoning. His analytical skill put him at the centre of the philosophical debate on causality and pragmatics. Denis collaborated for long time with the Herbert Simon Society as lecturer and as a member of Mind & Society.