He is credited with several creative contributions, among these his collaborations with Peyo on The Smurfs, with René Follet on Steve Severin (1/2) and André Franquin with the creation of Gaston Lagaffe and the co-authorship of Idées noires.

Where his first job was to retouch the cleavage in American comics which at the time were considered excessively lewd.

He handled other odd jobs, and over time touched upon a great deal of different occupations within the comics industry.

In 1955, upon becoming editor-in-chief of Spirou in place of Charles Dupuis, a long-lasting collaboration with Franquin began, which would spawn many creations.

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