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Patriciu served as a co-chair for the 2011 Atlantic Council Annual Awards Dinner which included notable speakers such as Joe Biden, Muhtar Kent, Plácido Domingo, Charlie Rose, Colin Powell, and James G. Stavridis among others.
In 1981 President Ronald Reagan made him Delegate-at-Large for Arms Control Negotiations with the rank of Ambassador; after retiring from public service in 1984 he served as President of the Atlantic Council, a foreign policy think tank.
The Forum is held annually in Washington DC in co-operation with the U.S. National Defense University and the Atlantic Council of the United States.
After his ministerial office, Stikker was ambassador to the United Kingdom (1952–1958) and head of the Dutch Permanent Representation to the North Atlantic council and to the Organization for European Economy Co-operation, the predecessor of the OECD (1958–1961).