Stoltenberg, Jens (yĕns stōlˈtĕnbĕrk) [key], 1959–, Norwegian political leader, b. Oslo. An economist, he graduated (1987) from the Univ. of Oslo and taught (1989–90) there. A member of the Labor party, he was first elected to parliament in 1993 and served as minister of trade and energy (1993–96) and finance (1996–97). Deputy party leader (1992–2002) and then party leader (2002–), he was briefly prime minister (2000–2001) and assumed the office again after a Labor-led center-left coalition won the 2005 elections. His government was returned to office in 2009 but lost power in the 2013 elections.