In 2022 Irving completed an ARC Discovery Grant project on constitutional citizenship and allegiance.
[2] Irving retired in 2020 from the University of Sydney Law School after 19 years of service.
Irving has held international visiting positions in Hong Kong (2004), London (2009), the Fernaund Braudel Senior Fellowship at the European University Institute (2015) and Harvard Chair of Australian Studies at Harvard Law School (2005-2006).
[6] By invitation of United Nations Development Program (UNDP), Irving co-authored a report (alongside Professor Vivien Hart) on gender equality and constitution-making for Iraq in 2003.
Irving has written over 50 opinion pieces for newspapers and journals on constitutional history and citizenship, in particular during the years leading to the centenary of federation, the republic debate, and the debate on the proposed adoption of a national Human Rights Act, and on citizenship.