Michael Atiyah has made fundamental contributions to many areas of mathematics, but especially to topology, geometry and analysis. From his first major contribution -- topological K-theory - to his more recent work on quantum field theory, Atiyah has been influential in the development of new theoretical tools and has supplied far-reaching insights. He is a notable collaborator, with his name linked with other oustanding mathematcians through their joint research. He was awarded a Fields Medal in 1966, has been President of the Royal Society and Master of Trinity College, Cambridge. Atiyah has been the recipient of many honours and awards, including a a knighthood in 1983 and the Order of Merit in 1992.