He trained at JesusCollege, Cambridge and WestminsterHospital medical school from where he qualified in 1986. He was appointed Consultant Physician at this hospital in 1991 where is presently the lead for HIV in patient and day case care and is a reader at Imperial College Medical School where he is also the deputy senior tutor. Since that time he has built a large HIV practice with a special interest in HIV in patient care, co-infection with hepatitis B and C and the clinical utility of new antiretroviral agents. He has published over 500 papers on HIV and hepatitis. Is presently the lead for HIV in patient and day case care.