James Gardner Oldroyd (25 April 1921 – 22 November 1982[1]) was a British mathematician and noted rheologist.
He formulated the Oldroyd-B model to describe the viscoelastic behaviour of non-Newtonian fluids.
Oldroyd was born in 1921 and educated at Bradford Grammar School, and Trinity College, Cambridge.
[2] In 1965 he moved to Liverpool University, becoming head of the Department of Applied Mathematics and Theoretical Physics in 1973 until his death.
[2] For this and other major papers he received international recognition, including the Gold Medal of the British Society of Rheology, and a tribute issue of its Bulletin on his sixtieth birthday.