Marius Job Cohen (Dutch pronunciation: [ˈmaːrijɵs ˈjɔp koːˈɦɛn]; born 18 October 1947) is a retired Dutch politician who served as Mayor of Amsterdam from 2001 to 2010 and as Leader of the Labour Party (PvdA) from 2010 to 2012. Cohen is known as a consensus builder and mediator, and as an advocate of social integration.Cohen a jurist by occupation, worked as a researcher for the Leiden University from 1971 until 1981 and for the State University of Limburg from 1981 until 1983. Cohen became a professor of jurisprudence at the State University of Limburg in 1983 and was appointed as rector of the State University of Limburg in 1991. Wikipedia