sentences:  From 1967 until the end of 1981 he was President of "De Nederlandsche Bank", the central bank of the Netherlands, and in the course of that period he was also President of the Bank for International Settlements in Basel.He has sat on many boards in the public and private sectors.On 11 March 1946 Zijlstra married his childhood sweetheart Hetty Bloksma (30 January 1921 – 19 November 2013).