In 1984, having won a comics competition, he was invited to study comics writing in Angoulême (France), then in 1987 worked for a few months at the Studios Hergé in Brussels.
After his death in 1983, Hergé's widow, Fanny, led the efforts, undertaken at first by the Hergé Foundation and then by the new Studios Hergé, to catalogue and choose the artwork and elements that would eventually become part of the Museum's exhibitions.
Universal Studios | Abbey Road Studios | Hergé | Ealing Studios | Pinewood Studios | Fleischer Studios | Walt Disney Animation Studios | Famous Studios | Boom! Studios | Ardent Studios | Elstree Studios | Trafalgar Studios | Marvel Studios | Granada Studios | Edison Studios | Universal Studios Florida | Shepperton Studios | Real World Studios | Electric Lady Studios | CBS Television Studios | Cartoon Network Studios | Blue Sky Studios | Van Beuren Studios | Studios Hergé | Strawberry Studios | Sony Pictures Studios | Sony Corp. of America v. Universal City Studios, Inc. | Riverside Studios | Essanay Studios | Disney Interactive Studios |
Leloup worked for both Jacques Martin, with Alix and Lefranc, and for Hergé, but as the production at the Studios Hergé slowed down, and Leloup came into contact with other artists.