Rayner is a senior lecturer in administrative and public law and an Australian Research Council (ARC) Discovery Early Career Researcher. His ARC project, Conditional citizenship: Revocation’s Implications for Australians (No. DE160101123) is a comparative study of contemporary law on deprivation of citizenship status, focusing on Australia, Canada, New Zealand, and the United Kingdom, and analysing the interaction between domestic and International law on nationality. Rayner is the author of, among other publications, The Liberty of Non-Citizens: Indefinite Detention in Commonwealth Countries (Hart Publishing, 2014). This book examines the legality of the indefinite detention of non-citizens pending deportation.He has an LLB/BA (Hons) from Melbourne and an LLM and SJD from the University of Toronto.