Jon Halliday is an Irish historian specialising in modern Asia and was a former Senior Visiting Research Fellow at King's College London.
Halliday authored a biography of filmmaker Douglas Sirk and has written and edited seven other books. He and his wife, Jung Chang, live in Notting Hill, West London. Together they researched and wrote the biography of Mao Zedong, Mao: the Unknown Story which received critical praise as well as serious criticism and spurred debate in the academic community.
Jon Halliday is the younger brother of Irish International relations academic and writer Fred Halliday.