Alex Callinicos is a Marxist political theorist and activist. He is the Emeritus Professor of European Studies at King's College London, where he worked until he retired in October 2020. From 2009 to 2020, he was the editor of International Socialism, the theoretical journal of the Socialist Workers Party, of whose Central Committee he has been a member. He has also served as the party's International Secretary. His most recent books include The New Age of Catastrophe (2023), Deciphering Capital: Marx's Capital and its destiny (2014) and  The Revolutionary Ideas of Karl Marx (2012).