This partnership, based at the Mathematics Education Research Centre at the University of Warwick, resulted in the theoretically important notion of procept.
Gray and Tall (1994) noted that mathematical symbolism often ambiguously refers to both process and concept, and that successful learners must be able to flexibly move between these different interpretations.
His first doctorate, a DPhil in mathematics at Oxford, with supervisor Professor Michael Atiyah, was awarded for work on "The Topology of Group Representations."
[citation needed] He was appointed lecturer in Mathematics at Sussex University in 1966, where he wrote his first text book Functions of a Complex Variable[6] and formed his own 'A Capella Choir and Orchestra'.
He retired in 2006 while remaining linked to the University of Warwick as a Professor Emeritus in Mathematical Thinking and was still writing and publishing papers until shortly before his death.