	In 2015, McMullin was a member of the B20 Turkey 2015 Taskforce on Trade in Istanbul, Turkey. From 2014–2016 he was the Director of Australasian Dispute Resolution Centre, which facilitates international mediation and cross-border dispute resolution in the Asia Pacific region. From 2013–2015 McMullin held the position of Senior International Business Advisor for the Minister of Foreign Affairs, Timor-Leste.