Michael Duff is professor of theoretical physics at Imperial College London. He made foundational contributions to string theory and M-theory. Autobiographical notes around encountering Chris Isham: See also: 478 (2022) 2259 [doi:10.1098/rspa.2022.0166] On KK-compactification of 11-dimensional supergravity on a squashed 7-sphere with G₂-holonomy (M-theory on G₂-manifolds): Moustafa A. Awada, Mike Duff, Christopher Pope, Supergravity Breaks Down to , Phys. Rev. Lett. 50 5 (1983) 294-297...