Prof Pozniak studied medicine at the University of Bristol UK and qualified in 1979. He started caring for patients with HIV in 1983 in London UK. In 1989 he went to Zimbabwe as a Consultant Physician where he researched for his doctorate in TB/HIV and moved back to the UK in 1991. He was head of the HIV research unit at King’s College, London before taking up his current position as Consultant Physician at the Chelsea and Westminster Hospital in 1998 where he was Director of the HIV service from 2008 until 2018.

He is currently the Honorary Professor (Clinical Research) at the London School of Hygiene & Tropical Medicine. He is President of the European AIDS Trial Network NEAT-ID, Principal Investigator for a Test and Treat project in Tanzania, and a Life member of the British HIV Association (BHIVA) and is on the BHIVA anti-viral HIV guidelines and chairs the TB/HIV guidelines committee. He is also a DSMB chair for MRC and PENTA studies, and guidelines panel member of the European AIDS Clinical Society. In addition, he is on the board of the Charity CUAMM UK. He was President of the International AIDS Society from 2018-2020, and he has published widely on clinical aspects of HIV treatment and HIV/tuberculosis.