MB, BCh, FRCP is an emeritus professor of medicine at the University College London School of Medicine as well as a consultant hepatologist at King’s College Hospital, London, UK, Geoffrey has received his undergraduate and postgraduate education in South Africa, and at the National Institutes of Health in the USA.

He has had a longstanding interest in research on persistent viral hepatitis, particularly viral genotyping, applied molecular virology, the natural history of chronic viral hepatitis, and antiviral therapies.

He is a member of EASL, AASLD, and the International Association for the Study of the Liver (IASL).

He Served as educational councillor on the Governing Board of EASL for 4 years and was the recipient of the EASL Recognition Award in 2014.  He served as deputy director in the Blood Safety, Hepatitis, HIV and Sexually transmitted infections Division of Public Health England in 2019

Has authored or co-authored more than 450 articles published in international peer-reviewed journals or books.