David Christian is by training a historian of Russia and the Soviet Union. In 1989, he began teaching courses on 'Big History' at Macquarie University, surveying the past on the largest possible scales, including those of biology and astronomy. In 2004, he published the first text on 'Big History'. In 2009 Bill Gates became very interested in Big History; he contacted Dr. Christian, and they collaborated on developing the free online course that is now available for high school students all over the world.
Social studies educators teach students the content knowledge, intellectual skills, and civic values necessary for fulfilling the duties of citizenship in a participatory democracy. The mission of National Council for the Social Studies is to provide leadership, service, and support for all social studies educators.