Swierzy is one of the Polish School of Posters' most prolific artists (created over 2500 posters).

Amongst his contributions were Cyrk posters belonging to the Polish School of Posters.

Posters of the Polish School of Posters significantly influenced the international development of graphic design in poster art.

Beginning in the 1950s and through the 1980s, the Polish School of Posters combined the aesthetics of painting with the succinctness and simple metaphor of the poster.

One of the younger of the Third Generation of artists of Polish School of Posters, he easily made the transition from socialism to capitalism; in 1990, he created his own graphic studio, STUDIO P, which developed into an advertising agency in 1993 and continues in operation today.