Ambassador Brengelmann has a distinguished record of public service. After a brief spell as an investment banker in Tokyo, he entered the German Foreign Service in 1984. He served as the Private Secretary of Jürgen Möllemann, Minister of State at the Federal Foreign Office, and then became Deputy Chief of Mission at the German Embassy in Port-au-Prince. He subsequently served as Political Counsellor at the German Embassy in London, Deputy European Correspondent in the Federal Foreign Office, and Political Counsellor at the German Embassy in Washington DC.
From 2000 to 2003, Ambassador Brengelmann served as Deputy Director in the Private Office of NATO Secretary General Lord Robertson. He then took up the position of Director and Head of Division at the Federal Chancellery in Berlin. After serving as Director and Head of the Defence and Security Policy Division at the Federal Foreign Office, he returned to Brussels in 2008 as Minister Plenipotentiary in the German Delegation to NATO, before being appointed NATO Assistant Secretary General for Political Affairs and Security Policy at the beginning of 2010.
Ambassador Brengelmann is married and has two children.