Oliver Lewis is the co-founder of Rebellion Defence, a British-American defence software 'unicorn' startup, and director of the national security and technology programme at the University of Oxford's Changing Character of War Centre. He is a senior visiting fellow at the University of Southern California and founding co-editor of the Routledge book series, Advances in Defence Studies. Prior to founding Rebellion Defence, Oliver was a senior civil servant in the UK Government Digital Service and was posted to Afghanistan multiple times from 2010-to 2012. On a previous career break from the Civil Service, he founded the defence business of another UK 'unicorn' startup, Improbable. Oliver is a trustee of the Common Mission Project (Hacking for Defence) and neurorehabilitation charity SameYou.