His sons Aldo Crommelynck (1931–2009), Piero (1934–2001), and Milan were renowned master printmakers, who worked with Pablo Picasso and many other major artists of the twentieth century.

French composer Cecile Paul Simon set Le marchand de regrets to music.

[2] Crommelynck's masterpiece was Le Cocu magnifique (1920), a 'lyrical farce' on the theme of a lover's jealousy.

Staged with constructivist sets by Vsevolod Meyerhold – the first of their kind – the theatre play was such a hit that Crommelynck was able to give up acting and devote himself to writing.

In Tripes d'or (1926) he satirized the passion for money and the spurious prestige it confers, while in Carine, ou la jeune fille folle de son âme (1929) he contrasted love and sensuality in the story of a chaste young girl who is faithful to her ideals of love to the bitter end.