In his substantive role, Troy is responsible for the department's management of sovereign capability and supply chain matters.  

Before this, Troy was the acting Deputy Secretary, Social Security, in the Australian Government Department of Social Services (DSS). In this role Troy was responsible for income support policies and programs. This included supporting families, carers, the aged, people with disabilities, students and apprentices, and people of working age. He also oversaw the department’s centralised data strategy and evaluation functions, and housing and homelessness policies and programs. 

Before this Troy held senior executive roles in DSS, the Department of the Prime Minister and Cabinet, the National Indigenous Australians Agency and the (then) Department of Infrastructure and Transport. In these roles Troy was responsible for data and analytics, the Closing the Gap refresh, delivery of large infrastructure projects, and taxation and employment policy. 

Troy has a Bachelor of Economics (honours) from the University of Adelaide.