Kjell Stefan Löfven (born 21 July 1957) is the Prime Minister of Sweden. He was a leader of Swedish trade union from 2006 to 2012. And he has been the leader of the Swedish Social Democratic Party since 2012. On 14 September 2014. he lead his party in the 2014 Swedish general election to become Sweden's new Prime Minister. Löfven was elected Prime Minister and took office in October 2014.