The diplomatic career of van Roijen began in the 1930s when he held positions in embassies in Washington and Tokyo as well as positions at the Ministry of Foreign Affairs in the Hague . Following the war , he represented the Netherlands at various conferences linked to the nascent United Nations , including the United Nations Conference on International Organization in San Francisco . After his brief stint as the Dutch foreign minister he was the ambassador to Canada ( 1947 – 1950 ) , to the United States ( 1950 – 1964 ) and jointly to the United Kingdom and to Iceland ( 1964 – 1970 )
United Nations Conference on International Organization
United Nations Conference on International Organization
Herman van Roijen