Clas Håkan Jesper Strömblad (born 28 November 1972) is a Swedish musician who is the guitarist of the bands Dimension Zero and Cyhra, formerly In Flames and The Resistance.
Jesper founded In Flames in 1993 originally as the drummer. He secured a record deal despite not having any songs written and no full line up. It was not until 1999 that Jesper managed to stock the band fully, and up until that point, he had written almost everything himself, or co-written it with a revolving door of friends and guest musicians.