Susan Pedersen, Gouverneur Morris Professor of History, specializes in British history, the British empire, comparative European history, and international history. Her book about the League of Nations and its impact on the imperial order, The Guardians: The League of Nations and the Crisis of Empire, appeared from Oxford University Press in summer 2015.

In 2014, Pedersen founded a graduate training collaboration in Twentieth-Century British history with Guy Ortolano of NYU and Peter Mandler of Cambridge University. PhD students working in this field participate in regular dissertation workshops and book discussions across all three institutions.