David Gilbert Christian, a historian and scholar of Russian history, has become notable for teaching and promoting the emerging discipline of Big History. In 1989 he began teaching the first course on the topic, examining history from the Big Bang to the present using a multidisciplinary approach with the assistance of scholars in diverse specializations from the sciences, social sciences, and humanities. Big History frames human history in terms of cosmic, geological, and biological history. Christian is credited with coining the term Big History and he serves as president of the International Big History Association. Christian's best-selling Teaching Company course titled Big History caught the attention of philanthropist Bill Gates, who is personally funding Christian's efforts to develop a program to bring the course to secondary-school students worldwide.