George F. R. Ellis is the emeritus distinguished professor of complex systems in the Department of Mathematics and Applied Mathematics at the University of Cape Town, South Africa. He is considered one of the world's leading theorists in cosmology and, in recent years, he has been prolific in areas relating to the philosophy of science. He is author or co-author of more than a dozen books, including Relativistic Cosmology (with Roy Maartens and Malcolm MacCallum, 2012).