C. L. R. James in Imperial Britain chronicles the life and work of the Trinidadian intellectual and writer C. L. R. James during his first extended stay in Britain, from 1932 to 1938. It reveals the radicalizing effect of this critical period on James’s intellectual and political trajectory. During this time, James turned from liberal humanism to revolutionary socialism. Rejecting the “imperial Britishness” he had absorbed growing up in a crown colony in the British West Indies, he became a leading anticolonial activist and Pan-Africanist thinker. Christian Høgsbjerg reconstructs the circumstances and milieus in which James wrote works including his magisterial study The Black Jacobins. First published in 1938, James’s examination of the dynamics of anticolonial revolution in Haiti continues to influence scholarship on Atlantic slavery and abolition. Høgsbjerg contends that during the Depression C. L. R. James advanced public understanding of the African diaspora and emerged as one of the most significant and creative revolutionary Marxists in Britain.