Mariusz Kubik · CC BY 3.0

An American foreign policy analyst and columnist who co-founded the neoconservative Project for the New American Century and became a prominent advocate of liberal internationalism, arguing for active American engagement abroad across both Republican and Democratic administrations. He served as a foreign policy adviser to Republican presidential candidates while also contributing to Democratic administrations through the Foreign Affairs Policy Board, and wrote a monthly column on world affairs for The Washington Post. In 2016 he broke publicly with the Republican Party over its nomination of Donald Trump and endorsed Hillary Clinton, a rare crossing of partisan lines for a figure of his standing.