Hayman was born in Cologne, Germany, and immigrated to Britain in 1938. He studied at Gordonstoun School, and later at St John's College, Cambridge, with Mary Cartwright and John Edensor Littlewood. He taught at King's College, Newcastle, and the University of Exeter. 
Honours and awards
Hayman was awarded the 1995 De Morgan Medal by the London Mathematical Society. He is a member of the Royal Society, the Accademia dei Lincei, and the Finnish Academy of Science and Letters. An issue of Computational Methods and Function Theory was dedicated to his 80th birthday.
- Hayman, W. K. (1964). Meromorphic functions. Oxford Mathematical Monographs. Oxford: Clarendon Press. MR 0164038.
- Hayman, W. K.; Kennedy, P. B. (1976). Subharmonic functions. London Mathematical Society Monographs I. London-New York: Academic Press. MR 0460672.
- Hayman, W. K. (1988). Subharmonic functions. London Mathematical Society Monographs II. London: Academic Press. ISBN 0-12-334802-1. MR 1049148.
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