In October 1951 Tony joined the Computing Machine Laboratory at Manchester University, where he took over from Alan Turing the task of writing programming manuals and running a user service on the Ferranti Mark I computer. It was his experience with the rather tedious Manchester machine-coding conventions that led him to devise what was probably the world's first publicly-available High-Level Language. This was the Mark I Autocode available from March 1954 and therefore about two years ahead of the first Fortran compiler.
Throughout the 1950s Tony led a group at Manchester working on the theoretical underpinnings of compilers. This culminated in the Compiler Compiler, a seminal idea first presented at a British Computer Society Conference in July 1960 by Brooker and Morris. This was subsequently implemented on the Ferranti ATLAS and used for high-level language development. The ATLAS was regarded as the world's most powerful computer when it was brought into service in December 1962.
In the mid-1960s Tony helped to inaugurate the UK's first Computer Science degree course at Manchester. He moved to Essex University in 1967 to take up the University's founding Chair of Computer Science. The first Essex Computer Science graduates obtained their degrees in the summer of 1970.