Dr Lei Si is an Associate Professor in Health Services Management at Western Sydney University. He is an Honorary Senior Fellow at the George Institute for Global Health and an Adjunct Professor at Nanjing Medical University. 

Dr Si undertakes research that employs health economics methods to promote efficient and equitable distribution of healthcare sources. He has extensive experience in cost-of-illness analysis, quality-of-life research, and health economic evaluation alongside clinical trials and model-based health economic evaluation. Dr Si has published over 100 papers in peer-reviewed journals. Many studies were published in top health economics or clinical research journals such as the New England Journal of Medicine, Circulation, JAMA Network Open, Value in Health, BMJ Global Health, Osteoporosis International, Quality of Life Research and Pharmacoeconomics. Lei's work has successfully attracted competitive funding of over $7 million from the NHMRC and MRFF (Australia), CIHR (Canada), NSFC (China), CMB (US), etc. 

Dr Si is Editor-in-Chief of Health Economics Review (Q1 in Economics) and an Associate Editor for BMJ Global Health (Q1 in Health Policy). He also serves on the editorial boards of several journals, including Osteoporosis International, Heliyon, International Journal of Rheumatic Diseases, Advances in Therapy, Frontiers in Public Health etc. He has been an External Evaluator of the Pharmaceutical Benefits Advisory Committee (PBAC).