sentences:  He also worked as the director of the Abraham Kuyper Foundation from 1 August 1963 until 22 November 1966.Zijlstra also became active in the private sector and public sector and occupied numerous seats as a corporate director and nonprofit director on several boards of directors and supervisory boards (Unilever, General Bank of the Netherlands, Hollandsche Bank-Unie, The People's Bank and the Carnegie Foundation).On 16 September 1966 Zijlstra was nominated as the President of De Nederlandsche Bank "(Central Bank of the Netherlands)".