Katainen studied at the University of Tampere. He is a member of the conservative National Coalition Party, whose leader he became in 2004.
Since 1993 Katainen is a member of the City Council of Siilinjärvi. He was first elected as an MP in the Finnish Parliament in 1999. Since April 19, 2007 Katainen Minister of Finance and Deputy Prime Minister is in the Cabinet of Prime Minister Mari Kiviniemi. In the parliamentary elections of 2011, the National Coalition Party won under his leadership 20.4 percent of the vote and became the strongest force in parliament. On 22 June 2011 he was elected by parliament as prime minister.
Beginning of April 2014 announced Katainen his resignation from both the Office of the Prime Minister and the party chairman in June 2014 and thus almost a full year before the next general election.
Since 2003, he is married to Mervi Marika Katainen ( born Kuittinen ). The couple lives in Espoo, near Helsinki and has two daughters, Saara (* 2005) and Veera (* 2008).
- 2011: Grand Gold Medal with Ribbon for Services to the Republic of Austria