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Jean De Mesmaeker (21 December 1935 to 30 April 2017), known by the pseudonym Jidéhem (from the initials "JDM"), was a Belgian comics artist in the Marcinelle school tradition. He was best known for his series featuring a cute, playful and adventurous young girl, Sophie. A creator of his own series Sophie, and Ginger, and noted for his work with Starter and Uhu-man, he is known for his collaborations and assistance to the work of André Franquin during a long career at the Franco-Belgian comics magazine Spirou, working on Spirou et Fantasio and Gaston Lagaffe, on which he shared co-authorship for several years.