Judith Herrin studied history at the Universities of Cambridge and Birmingham, receiving her doctorate from the latter; she has also worked in Athens, Paris and Munich, and held the post of Stanley J. Seeger Professor in Byzantine History, Princeton University before taking up her appointment as the second Professor of Late Antique and Byzantine Studies at King's. Upon her retirement in 2008 she became a Research Fellow in the Department.

She is best known for her books, The Formation of Christendom (London 1989), Women in Purple (London, 2000), and Byzantium: the Surprising Life of a Medieval Empire (London, 2007); she has also published widely on Byzantine archaeology and other fields. Her current research interests include women in Byzantium and Byzantium in relation to Islam and the West. In 2002 she was awarded the Golden Cross of Honour by the President of the Hellenic Republic of Greece.