Historian and writer, specialising in modern Greece, 20th century Europe and international history. He is a professor of History at Columbia University.
He studied Classical History and Philosophy at Oxford, International Relations at the Johns Hopkins University Bologna Centre and has a PhD in Modern History from Oxford (1988).
He published «Hitler's Empire: Nazi Rule in Occupied Europe» (Allen Lane) in 2008, which won the LA Times Book Prize for History the same year.
His most recent book is «What You Did Not Tell: A Russian Past and the Journey Home» (Other Press, 2017).