Mr Langman was appointed Deputy Secretary in March 2018. Prior to that, he was Australia's Ambassador to Iraq. Mr Langman earlier served as Ambassador to the OECD in Paris, as Deputy Head of Mission to the United Nations in Geneva, and in Washington and Buenos Aires.
In Canberra, Mr Langman has held a number of senior positions, including as First Assistant Secretary, G20 Policy in the Department of Prime Minister and Cabinet in the lead-up to and during Australia's host year in 2014. He has also led DFAT's Trade and Economic Division, and the Office of Trade Negotiations, and was Special Negotiator for Agriculture and Australian Ambassador for the Environment.