Mr Sheehan joined DFAT as Deputy Secretary International Security, Humanitarian and Consular Group on 2 October 2018. He was most recently Commonwealth Counter-Terrorism Coordinator from September 2016. In that position, he was responsible for coordinating Australia’s Counter-Terrorism arrangements for the Prime Minister and the Minister for Home Affairs and working in close partnership with Commonwealth and State and Territory agencies.
Prior to that he served as a Deputy Director-General in Australian Security Intelligence Organisation (ASIO), which followed several years as Deputy Secretary, and then Chief Operating Officer in the Attorney-General's Department. Mr Sheehan previously served as First Assistant Secretary Homeland and Border Security in the Department of the Prime Minister and Cabinet.
Before this, he spent 19 years at DFAT. He had overseas postings to Taipei, Beijing and Jakarta and then held a number of Senior Executive Service (SES) positions in Canberra with responsibilities for counter terrorism, people smuggling and other transnational issues.
Mr Sheehan is a graduate of Monash University. He majored in Mandarin.