Adrian Clive Hayday (born April 1956)[3] is a British immunologist who is the Kay Glendinning professor and chair in the Department of Immunobiology at King's College London and group leader at the Francis Crick Institute in the UK.

[6] Hayday began studying immunology as a postdoctoral researcher in 1982 at Massachusetts Institute of Technology (MIT) supervised by Susumu Tonegawa,[2][7] where he identified the molecular basis of oncogene activation in Burkitt's lymphoma.

Their rapid responses to tissue dysregulation offer protection from carcinogenesis, underpinning Hayday's and others' ongoing initiatives to employ the cells for immunotherapy.

[8] Hayday has received numerous awards, including the William Clyde DeVane Medal, Yale's highest honour for scholarship and teaching.

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