Darrell founded DIEM Consulting Ltd in 2002 after a career that had encompassed strategic decision making within the UK Ministry of Defence and advising corporates & governments at the London office of leading strategy consultants McKinsey & Co. He then founded DIEM Analytics Ltd in 2011 to conduct R&D into decision-aides and AI, and has led DIEM's projects for the UK and US military, think-tanks and NATO. He sits on the UK MOD's AI Ethics Advisory Panel and has lectured on Strategic Change at Birkbeck College, University of London and the Role of the Board at the UK Defence Academy. He has featured in articles in Janes International Defence Review and UK MOD publications, and has published articles on strategy in the prestigious McKinsey Quarterly, on how risk should be communicated to the board in Risk Management magazine & on stakeholder engagement in Expert Witness magazine. He has a degree in Engineering from Christ's College Cambridge and a PhD in Ballistics from the Royal Military College of Science, Cranfield University.