Colin Rourke is a professor emeritus of mathematics at the University of Warwick, and has also taught at the Princeton Institute for Advanced Study, Queen Mary College London, the University of Wisconsin at Madison, and the Open University, where he masterminded rewriting the pure mathematics course; he has recently retired from lecturing after completing a half-century (of 50 years of lecturing). He has written papers in high-dimensional PL topology, low-dimensional topology, combinatorial group theory, differential topology, relativity and cosmology.