 His scratchy pen-and-ink style is influenced by the impressionists, illustrators of the age of "liberated penmanship" such as Phil May, Charles Dana Gibson, John Leech and George du Maurier, and cartoonists Milton Caniff and Frank Frazetta (particularly his "Johnny Comet" strip).Campbell's writing has been compared to that of Jack Kerouac and Henry Miller.Campbell has won almost every award the comics industry bestows, including the Eisner Award, the Harvey Award, the Ignatz Award, the Eagle Award, and the UK Comic Art Award.