S. Barry Cooper is Professor of Mathematical Logic at the University of Leeds. His research follows that of Alan Turing in its focus on the nature of mental and physical computation. His other books include the prize-winning Alan Turing: His Work and Impact, Computability Theory, New Computational Paradigms, and Computability in Context. Cooper is a leading advocate of multidisciplinary research at the interface between what is known to be computable, and theoretical and practical incomputability. He chaired the Turing Centenary Committee, which coordinated the international Turing Centenary celebrations. He is also President of the Association Computability in Europe, which is responsible for the largest computability-themed international conference series, and he chairs the editorial board of its book series, Theory and Applications of Computability.