Clas Håkan Jesper Strömblad (born 28 November 1972) is a Swedish musician who is the guitarist for the bands Dimension Zero and The Resistance. He is best known as founder and former guitarist/drummer/keyboardist of the Swedish melodic death metal band In Flames, guitarist of the band Sinergy, bassist of Ceremonial Oath and drummer of HammerFall. In 2013 he joined MDM band Nightrage as a session guitarist.In March 2004, Jesper (along with Björn Gelotte) was ranked No.