Fergus is the First Assistant Director General running the Cyber and Critical Technology Intelligence Centre at the Office of National Intelligence.

Prior to joining ONI, Fergus was the Director of ASPI's International Cyber Policy Centre.

He is the author of Internet Wars and has published widely on a range of cyber and foreign policy topics.

He was a Visiting Fellow at the Brookings Institution and a Professional Fulbright Scholar based at Georgetown University working on the uptake of new technologies by the US government.

He has worked for the UN, as a Program Director at the Lowy Institute and served as a diplomat at the Australian Embassy in The Hague. While working for philanthropist Andrew Forrest he established the Freedom Fund in London and the Global Fund to End Modern Slavery in Washington D.C.

He has been a Fellow at Cambridge University’s Lauterpacht Research Centre for International Law and the Centre for Strategic and International Studies, Pacific Forum. He is a member of the board of directors of the Catherine Hamlin Fistula Foundation and Art Monthly Australasia. He previously served as an Advisory Board member of the Cyber Peace Institute in Geneva.