- His career as a showman began at the Université libre de Bruxelles, where he attended and then directed the Jeune Théâtre. It was there that a group of young actors was formed, who, like him, would become pillars of audiovisual creation in the French Community of Belgium.
- He was also the founder of the Rideau de Bruxelles theatre troupe.
- Henri Billen was one of the creators of television in the French speaking part of Belgium.
- He had orchestrated the very first French speaking Belgian television broadcast, on October 31, 1953.
- He had been sent on a mission to French television to see how to create one in Belgium.
- He was a sort of mentor for a series of actors, journalists, television men in the French Community. Characters who, just like him, later left their mark on the Belgian French speaking media landscape.
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