Background
Van Kleffens was born to Henricus Cato Van Kleffens and Anna de Graaf in a family of civil servants in Heerenveen.
Van Kleffens was born to Henricus Cato Van Kleffens and Anna de Graaf in a family of civil servants in Heerenveen.
Leiden University.
He was a judge at the European Court of Justice from 1952 to 1958. Adrianus van Kleffens studied law at Leiden University. After his studies he then went to work at the Secretariat of the League of Nations in Geneva.
He later became a judge at the Court of Amsterdam.
During World World War II he was captured and made prisoner of war. After the war had ended in 1945 he went to work at the same Ministry once more, he focused on European economic integration.
During that time he also advocated the Benelux union. After his time at the Ministry he became one of the first judges of the European Court of Justice, he served together with fellow Dutchman Jos Serrarens.
Member of the International Maritime Commission.