Keith studied for a BSc at the University of East Anglia and MSc at King’s College London before starting his working life in 1990 as an administrator for the homelessness charity Crisis. He was the fourth member of staff to join, when the headquarters were a converted flat on London’s Whitechapel Road. In 1992, having lost a number of friends to AIDS, Keith became Information Manager at The Landmark, a charity dedicated to providing day-care, support and practical services to those living with HIV/AIDS in London. The early '90s was a heart-breaking period for anyone supporting those with HIV, but by 1997 the introduction of antiretroviral therapies (ART) began to change the landscape of treatment and survival. Many charitable HIV/AIDS organisations restructured as the need for their services declined and as health authorities redirected funding towards new treatments. Keith took voluntary redundancy from The Landmark but wanted to pursue a career in health-related research and so joined the LSHTM as a Data Manager in 1997. He has subsequently taken the School’s MSc in Epidemiology, and has combined both disciplines across a number of large research programmes.

Keith's main research interest remains the treatment and management of HIV infection. He has a longstanding research collaboration with the ALPHA Network (Analysis of Longitudinal Population HIV data on Africa) and has also worked with Project SIGMA (Socio-sexual Investigations of Gay Men and AIDS) and with the Integra Initiative, which evaluated the effect of integrating family planning and sexual health services in Kenya and Swaziland.

Keith fondly remembers his good friend the artist Nick Balaban, who died of AIDS related illnesses in 1994, and who is the reason for all of this.