He is an adjunct Professor in Medicine at Imperial College. Simon is Clinical Chair of the Blood and Infection NPoC Board, previously having chaired the HIV CRG for four years until 2015. From 2008–14 he was Clinical Advisor on Sexual Health for the London Sexual Health Programme, was President of the British Association for Sexual Health & HIV (BASHH) from 2006–2008 and Clinical Director of HIV, GUM , Dermatology and Pathology from 1996 until 2014. He is actively involved in educational and training issues in HIV and sexual health, being the UK representative to the European Union of Medical Specialists.