David Christian (D.Phil. Oxford, 1974) is Director of Big History Institute and Distinguished Professor in History in the Department of Modern History at Macquarie University. By training he is a historian of Russia and the Soviet Union, but since the 1980s he has become interested in World History on very large scales, or 'Big History'. He was founding President of the International Big History Association, and is co-founder with Bill Gates of the Big History Project, which has built a free on-line high school syllabus in big history. His next book, Origin Story: A Big History of Everything, will be published in May 2018.