Peter Sewell is a Professor of Computer Science at the University of Cambridge Computer Laboratory, a Fellow of Wolfson College, Cambridge, and a Fellow of the Royal Society. He took his PhD in Edinburgh in 1995, supervised by Robin Milner, after studying in Cambridge and Oxford. His research aims to build rigorous foundations for the engineering of real-world computer systems, to make them better-understood, more robust, and more secure. He and his colleagues have recently focussed on the relaxed-memory concurrency models of multiprocessors and concurrent languages (x86, Arm, RISC-V, IBM Power, and C/C++11), on semantics and verification for C, and on CHERI capability-enhanced architectures and languages. Earlier he worked on verified compilation of concurrency (CompCertTSO and the concurrency compilation schemes from C/C++11 to x86, Power, and ARM), on tools for applied semantics, and on various topics in programming languages, network protocols, security, and concurrency theory.