Dr Tom Simpson is University Lecturer in Philosophy and Public Policy at the Blavatnik School of Government, University of Oxford, and a Senior Research Fellow at Wadham College. He joined the School from Cambridge, where he was educated (BA, MPhil, PhD) and was a Research Fellow at Sidney Sussex College. Between degrees he served as an officer with the Royal Marines Commandos for five years, with tours in Northern Ireland; Baghdad, Iraq; and Helmand Province, Afghanistan. Tom’s research centres on the notion of trust and both its theoretical and practical implications. Trust raises important theoretical questions. These include: What is trust? When is trust justified? Under what conditions do we know by trusting others? How should trust be restored when broken? Areas of practical application are numerous. During his doctorate he worked with Microsoft Research on trust on the Internet. He is currently engaged on a collaboration with Groningen and Cambridge looking at the restoration of trust in banking. He also works on the ethics of war.