His research focuses on improving outcomes for people living with hepatitis. He is a clinical investigator in trials evaluating the efficacy of new treatments for viral hepatitis. He has been actively pursuing new models of care for people living with viral hepatitis, with a focus on prisoners and community-based care for high prevalence populations.  

Alex has written guidelines on the management of hepatitis C, hepatitis B, HCC and non-invasive assessment of portal hypertension. He has previously been the Chair of the GESA Liver Faculty as well as an Executive Council Member of the Asia-Pacific Association for the Study of the Liver (APASL).  

He is an Associate Editor of the journal Hepatology and a former Associate Editor of the journal Liver International. He has published more than 200 manuscripts in peer-reviewed journals including Nature, New England Journal of Medicine, Journal of the American Medical Association, Gastroenterology, Hepatology, Gut and Journal of Hepatology.