In 1925, Sallon joined Everybody's Weekly, producing a regular caricature of people in the news. "I was affected by 'Spy' and 'Ape's work", Sallon recalled: "So exquisitely done without respect for anyone." In 1932, he began contributing to the Daily Mirror as a freelance. In 1943 he began contributing regularly to the Daily Herald, and for the first time was on a fixed salary. In 1948 he became staff caricaturist on the Daily Mirror, where he remained until 1991. Sallon liked to draw from life, and often worked alongside the press photographers outside London hotels, dashing off a sketch with the stub of a pencil before his target disappeared in a taxi. He claimed to be "less interested in politics than most people," and disliked arrogance, once claiming that "the forte of my work is to have a go at people who think they rule our destinies."