Ruben Stewart

Senior Fellow, Land Warfare International Institute of Strategic Studies

Ruben's duties include leading the Institute's research on contemporary and future land warfare. His work focuses on the conduct and character of land conflict, force employment, operational adaptation, and the implications of technological change for land forces. He is engaged in analysis, writing, and publishing, and works across the Defence and Military Analysis programme and with other IISS research teams to support land warfare assessments in IISS databases and publications. His research interests span force preparedness, operational art, and combat decision-making, as well as the interaction between land forces, other domains, elements of national power, and the civilian environment. He also examines how human factors such as command, leadership, professional education, and societal factors shape military adaptation and operational effectiveness, including in the context of the integration of AI-enabled and uncrewed systems.