Keith is now retired but still active as an Emeritus Fellow. When a Senior Academic at The University of Westminster, his major teaching areas were Medical Microbiology, Molecular Biology, Health & Safety. He was a Senior Academic in Microbiology & Molecular Biology, Director of Postgraduate Studies, the Campus Health and Safety Officer and the University Biological Safety Officer. He was the course leader for the Postgraduate Certificate Molecular Biology in Medicine by Distance Learning and Chair of the Campus Safety Management Team. He was also a member of the University Ethics Committee and Research Ethics Committee and a member of the Academic Conduct Group.
He was previously a Senior Lecturer in Microbiology at Harrow College of Higher Education and a Lecturer in Biology at Lincoln College of Technology. He was a Graduate Research Scientist at the National Collection of Type Cultures at the Central Public Health Laboratory (Health Protection England), London.