From 1962 to 1965 Kooijmans was
lector (associate professor) of international and European law at the VU, and on 26 March 1965 he was appointed full professor of international law, succeeding
Gezina van der Molen. In 1976 and again in 1991, he served as a lecturer at
The Hague Academy of International Law. After the
election of 1972 Kooijmans was appointed as
State Secretary for Foreign Affairs in the
Den Uyl cabinet until 19 December 1977. The Cabinet Den Uyl fell on 22 March 1977 after four years of tensions in the coalition and continued to serve in a
demissionary capacity. In May 1977 Kooijmans announced that he would not stand for the
election of 1977. Following the
cabinet formation Kooijmans did not return in the new
cabinet. Kooijmans semi-retired from national politics and served as a professor of international law at
Leiden University from 10 January 1978 until 20 December 1992. He also taught international law and international relations at
The Hague Academy of International Law from 1 August 1979 until 1 November 1989. Kooijmans also served as
United Nations special rapporteur on
human rights and
torture. Kooijmans was appointed as
minister of foreign affairs in the
Third Lubbers cabinet following the appointment of
Hans van den Broek as the
European Commissioner, taking office on 3 January 1993. In September 1993 Kooijmans announced that he would not stand for the
election of 1994. He served as a
Judge on the
International Court of Justice from 1997 to 2006. On 5 February 2014, Kooijmans'
alma mater, the VU, started the Kooijmans Institute. ==Decorations==