Secretary-General Member State Beginning End Commission Émile Noël France 26 March 1958 18 September 1987 Hallstein I Hallstein II Rey Commission Malfatti Commission Mansholt Commission Ortoli Commission Jenkins Commission Thorn Commission Delors I David Williamson United Kingdom 19 September 1987 31 July 1997 Delors I Delors II Delors III Santer Commission Carlo Trojan [nl] Netherlands 1 August 1997 31 May 2000 Santer Commission Prodi Commission David O'Sullivan Ireland 1 June 2000 10 November 2005 Prodi Commission Barroso I Catherine Day Ireland 11 November 2005 1 September 2015 Barroso I Barroso II Juncker Commission Alexander Italianer Netherlands 1 September 2015 1 March 2018 Juncker Commission Martin Selmayr Germany 1 March 2018 30 November 2019 Juncker Commission Ilze Juhansone(acting) Latvia 24 July 2019 Ongoing Juncker Commission von der Leyen Commission