Norman GrayNorman Gray is in the School of Physics and Astronomy, University of Glasgow, where he has, over the last 20 years, taught courses covering both special and general relativity. Since his PhD in particle theory, he has had a varied research career, mot recently concentrating on the interface between astronomy and computing. He is author of A Student's Guide to General Relativity (2019), which has been a successful addition to Cambridge University Press's growing series of Student's Guides. Read More Read Less