Luke March is Professor of Post-Soviet and Comparative Politics at the University of Edinburgh. He is author of The Communist Party in Post-Soviet Russia (Manchester University Press, 2002), Radical Left Parties in Europe (Routledge, 2011) and The European Left Party: A Case Study in Transnational Party Building, with Richard Dunphy, (Manchester University Press, 2015).

Daniel Keith is Lecturer in the Department of Politics at the University of York. He wrote his doctoral thesis on the role of organisational factors in shaping the diverse programmatic adaptation of West European Communist parties and their successor parties. He has published articles on the Portuguese Communist Party and the Socialist Party and Green Left in the Netherlands.