Johannes Guillaume Christianus Andreas "Jan" Marijnissen () (born 8 October 1952) is a retired Dutch politician of the Socialist Party (SP). Marijnissen, a welder by occupation, was selected as Leader of the Socialist Party after the death of Daan Monjé on 1 October 1986 and became Chairman of the Socialist Party on 20 May 1988. For the election of 1994 Marijnissen was the Lijsttrekker (top candidate) and won two seats in the House of Representatives, the first time the Socialist Party won representation in the States General of the Netherlands. Marijnissen was elected as a Member of the House of Representatives on 17 May 1994 and became the Parliamentary leader of the Socialist Party in the House of Representatives. For the elections of 1998 and 2002 Marijnissen again as Lijsttrekker won three and four seats respectively. For the election of 2006 Marijnissen for the fifth time as Lijsttrekker won sixteen seats and the Socialist Party became the third-largest party in the House of Representatives. On 20 June 2008 Marijnissen announced his retirement as Leader of the Socialist Party and Parliamentary leader of the Socialist Party in the House of Representatives citing health reasons. Marijnissen remained a Member of the House of Representatives until after the 2010 general election. Marijnissen stood down as Chairman of the Socialist Party on 28 November 2015. He is the father of Lilian Marijnissen, the current Leader of the Socialist Party. Early life Johannes Guillaume Christianus Andreas Marijnissen was born on 8 October 1952 in Oss in the Dutch Province of North Brabant in a Roman Catholic family. After leaving secondary school shortly before the exams, he worked in a number of factories in and around Oss. He then trained as a welder, working for ten years in the metal industry. Politics Local politics Meanwhile, he helped founding the SP in Oss and, in 1975, became the Netherlands' youngest councillor ever. He remained a councillor until 1993, playing a leading role in many campaigns, such as against polluting discharges. The SP's council representation in Oss has grown at every local election and is, as of 2005, the biggest stronghold of the Socialist Party in the Netherlands. Nicknamed "The Wizard of Oss", after his hometown, he became famous when he turned out to be one of the main architects of the Dutch vote that rejected the European Constitution in June 2005. In 1987 Marijnissen became the party's