Geoff Skillen served as a legal officer in the Australian Defence Force from 1975–98. From 1995–98, he occupied the position of Director-General of Defence Force Legal Services, holding the rank of Air Commodore. From 1998–2010, he served as a legal officer in the Attorney-General’s Department. From 2003–10, he was the Principal Legal Officer in the Office of International Law, International Human Rights section. Since 2010 he has performed academic work at The Australian National University College of Law and has undertaken a number of roles on contract with the Australian Government. He is a long-standing member of the Red Cross movement, serving on a number of Australian Red Cross committees since 1995. Since July 2010 he has been the Chair of Australian Red Cross’s national committee on International Humanitarian Law.