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 MDM band Nightrage as a session guitarist.

In Flames is a Swedish heavy metal band, formed by guitarist Jesper Strömblad in Gothenburg in 1990. Their lineup has changed several times, with vocalist Anders Fridén and guitarist Björn Gelotte being the only consistent members since 1995. Alongside At the Gates and Dark Tranquillity, In Flames has pioneered the genres known as Swedish death metal and melodic death metal, and as of 2008, has sold over two million records worldwide.