In 1959, the Smurfs got their own series. Many authors of the Marcinelle school worked together on the writing or as an artist. These include Willy Maltaite (aka 'Will'), Yvan Delporte, and Roger Leloup. Peyo became more of a businessman and supervisor. He let his son, Thierry Culliford, lead the studio. His daughter Véronique was responsible for the merchandising.