Glennie subsequently worked at Atomic Weapons Research Establishment (AWRE) where he was responsible in the early 1960s in developing FORTRAN compilers for several large computers inc. IBM 709, IBM 7090, IBM 7030 ("Stretch") and also ICT Atlas.
Glennie's work at AWRE involved developing FORTRAN compilers for several large computers in the early 1960s, such as IBM 709, IBM 7090, IBM 7030 ("Stretch"), and ICT Atlas.