Education and first assignments After finishing his A-levels in 1973, Nielson entered the
West German navy as reserve officer candidate. From 1974 to 1975 he served as Watch officer on the coastal
minesweeper Koblenz and Wetzlar with the 6th minesweeping squadron in Wilhelmshaven. Beginning in 1975 he studied economics at the
Helmut Schmidt University of the Bundeswehr in Hamburg and graduated in 1978 with a master's degree. After graduating he returned to the
German Fleet and served as watch officer on board of the
minehunter Flensburg, Cuxhaven and Koblenz. From 1980 to 1981 he completed a special training course related to the application of submerged weapons at the Navy weapon school in Eckernförde. He subsequently took over command of the minehunters Tübingen in 1983 and Paderborn in 1985. In 1985, Nielson released his command and was redeployed to the West German defense staff in Bonn where he served as junior adviser.
Staff officer assignments From 1986 to 1988 he successfully joined the 28th Command and General staff course at the
Führungsakademie der Bundeswehr of the Bundeswehr in Hamburg and was promoted to the rank of
corvette captain. In 1988 Nielson became the operations officer and deputy commander of the 6th minesweeping squadron in Wilhelmshaven. In 1990 he returned to the
Federal German Ministry of Defense in Bonn where he served as adviser in the Directorate-General for Personnel. From 1994 to 1997 he was the special assistant to the Director-General for Personnel of the Ministry of Defense. In 1997 he took over command of the 6th minesweeping squadron in Wilhelmshaven. A further redeployment in 1998 brought Nielson back to the
German Ministry of Defense where he became Branch Chief Central Affairs within the Directorate-General for Plans and Policy by simultaneously being promoted to the rank of captain. In 2000 he changed his post within the same Directorate and served as Branch Chief Personnel. From 2002 to 2002 Nielson was Director of the personal office of the Deputy Secretary of Defense Klaus-Günther Biederbick.
Flag assignments In 2003, Nielson was promoted to the rank of
rear admiral (lower half). He took command of the
German Naval Academy in Flensburg and was in charge of the education of all prospective German naval officers. From May till October 2003 he was deployed to the
Horn of Africa where he served as Commander
Combined Task Force 150 with the
Operation Enduring Freedom. In 2005 he was once again redeployed to the
Ministry of Defence where he acted as Division Chief of the Directorate-General for Personnel. In 2008, Nielson was promoted to
rear admiral (upper half). He served as Chief of Staff of the German Defense Staff within the Ministry of Defense under the command of the German Chiefs of Defense Wolfgang Schneiderhan and Volker Wieker. On July 1, 2010, he was promoted to
vice admiral and became Commander of the German Fleet Command in Glücksburg. During that tour of duty vice admiral Nielson was selected by the Secretary of Defense
Thomas de Maizière to become Director of a special staff that was created to prepare the intended restructuring process of the Bundeswehr. In June 2011 he was selected as Special Director for the audit of all running and planned procurement projects of the Bundeswehr under the scope of the restructuring process. This job was followed by the order to prepare the establishment of a new Directorate-General for Planning within the Ministry of Defense in Berlin. In April 2012 he took command of the
Joint Support Service Command of the German Forces in Bonn leading over 43,000 personnel. Nielson took over his new assignment within
NATO as
Deputy Supreme Allied Commander Transformation in
Norfolk, Virginia on March 24, 2016. He is the fifth German naval officer since 1955 to hold the rank of a full admiral. ==Awards and decorations==