Professor Riordan specialises in both Gastroenterology (the study of the gastrointestinal tract and digestive system) and Hepatology (the study of the liver), including the full spectrum of viral and other causes of acute and chronic liver disease and complications such as cirrhosis, portal hypertension, liver failure and hepatocellular carcinoma.

Patients consulting Professor Riordan have access to modern diagnostic and therapeutic modalities, including endoscopic and other procedures, along with state-of-the-art technologies such as Fibroscan™, an ultrasound-based device that provides an instantaneous and completely non-invasive assessment of the severity of liver disorders, without the need for traditional liver biopsy.

Patients also have access to a range of the latest pharmacological treatments, prior to their more general availability, through Professor Riordan’s long-standing involvement as Principal Investigator in nationally and internationally co-ordinated Clinical Trials.

Professor Riordan works collaboratively with specialist Gastroenterological and Liver Radiologists, Pathologists, Surgeons (Upper Gastrointestinal, Hepato-Biliary and Colorectal), Intensive Care Physicians, other medical, nursing and allied health specialists and referring doctors, in order to integrate and optimise patient management.

Clinics are conducted daily Monday to Friday in order to facilitate ready accessibility for patients and their referring doctors. Professor Riordan is pleased to accommodate patients referred for urgent specialist assessment and management.

All consultations are bulk-billed for Medicare-eligible patients, while diagnostic and therapeutic procedures are also bulk-billed or performed under a strict "No Gap" policy.