Roman is a highly experienced senior executive with public sector appointments including Commissioner of the Australian Border Force (ABF) (2015-18); CEO of the Australian Customs and Border Protection Service (2013-15); ACT Chief Police Officer (2010-13); and a/Deputy Commissioner of the Australian Federal Police. In these roles, he was responsible for the protection of the Australian community and Australian public assets, including its critical infrastructure. He was a substantive member of the Australia and New Zealand Counter Terrorism Committee (ANZCTC), the Chair of both its Operational Response Capability and its Chemical, Biological, Radiological, Nuclear and Explosives sub-committees, and participated in the development of ANZCTC's Mass Gathering policy guidance to industry.

He was also a member of the ANZCTC Capability Support Group, responsible for the allocation of Federal counter-terrorism funding to States and Territories to build national Prepare, Prevent, Response and Recovery capabilities. Roman was co-opted as an enforcement and tactical specialist into a Commonwealth-led review of national arrangements to respond to national Active Shooter incidents and was concurrently the architect of the Federal Government's 2017 National Firearms Amnesty program.

Roman has extensive experience across the four pillars of critical infrastructure, including an intimate knowledge of global supply chain vulnerabilities and the establishment of insider threat and corruption programs. He has run very large organisations with direct reporting responsibility to the Federal Minister and the Australian Parliament for a range of functions including customs, immigration, Australian trade flows, maritime enforcement and combating transnational crime.

As ABF Commissioner he oversaw an operating budget of $2.5 billion and led a 6,000-strong workforce. Roman was responsible for the merger of the federal Customs and Immigration organisations and the associated multi-year reform programs including the co- design of the Federal Department of Home Affairs.