Clas Håkan Jesper Strömblad is a Swedish musician who is the guitarist of the bands The Halo Effect, Dimension Zero and Cyhra, and formerly of In Flames and The Resistance. He is best known as the founder and former guitarist/drummer/keyboardist of the pioneering melodic death metal band In Flames, guitarist of the band Sinergy, bassist of Ceremonial Oath and drummer of HammerFall. In 2013, he joined Nightrage as a session guitarist.