Diederik Maarten Samsom (Dutch pronunciation: [ˈdidəˌrɪk ˈmaːrtən ˈsɑmsɔm]; born 10 July 1971) is a Dutch politician. As a member of the Labour Party (Partij van de Arbeid) he has been an MP since 30 January 2003. He is the party's spokesperson on environmental issues. On 16 March 2012 he was elected parliamentary leader as well as party leader. Before his election to parliament he was CEO of a green energy company and a campaigner for Greenpeace Netherlands.