Mason Clark is the Director of the Defense of Europe Project at the Institute for the Study of War. Mason’s current research and long-form writing efforts focus on current Russian conventional military capabilities; NATO’s force requirements to deter or defeat future Russian aggression; and the operational-level history of Russia’s full-scale invasion of Ukraine.
Mason joined ISW in 2018 and led ISW’s Russia Team from July 2020 to December 2023. In this role, Mason designed and led ISW’s standard-setting coverage of the full-scale Russian invasion of Ukraine. In addition to writing and managing the production of hundreds of ISW’s daily updates, Mason has published multiple ISW reports on Russian military learning and thinking. He has published externally with Foreign Affairs, Chatham House, and others, and has been extensively quoted in leading international media coverage of the full-scale Russian invasion of Ukraine. Mason regularly briefs senior military and civilian decision makers in the United States, NATO allies, Ukraine, and other partner states.
