Liam lectured at the La Trobe University Department of Economics from 1997 to 2021.
His PhD thesis dealt with exchange rate determination models and macroeconomic cycles. However, his research more recently has centred more on sports economics, specifically rules, regulation, incentives and athlete behaviour; with an emphasis on various forms of cheating (doping, match-fixing, etc.).
Liam has held visiting positions at: University of Michigan (US); Massachusetts Institute of Technology (US); University of Otago (NZ); Lancaster University (UK); University of Exeter (UK) and Monash University.
Liam was promoted to full lecturer in the La Trobe University Department of Economics and Finance in December 2002 and to senior lecturer in November 2007.
He joined Adelaide University as an Adjunct Senior Lecturer in Economics in 2021.