Jean Pleyers is a Belgian comic book artist originally from Verviers. After his studies at the Saint-Luc Art Institute in Liège, Pleyers assisted Gérald Forton on the series 'Teddy Ted' in Pif Gadget and 'Tiger Joe' in La Libre Belgique Junior (script by André-Paul Duchâteau) from 1966. Next, Pleyers contributed some short stories to Le Soir Jeunesse and illustrated some historical features in the series 'Les Belles Histoires de l'Oncle Paul' for Spirou. In 1971, he assisted Cuvelier on the 'Line' episode 'La Caravane de la Colère' and made comic adaptations of about a dozen novels for Artima.
In the following three years, while living in The Little Antilles, he drew 'Pat Le Guadeloupéen' for Pointe à Pitre. Back in Belgium, he started a collaboration with Jacques Martin, whom he assisted on 'Alix' and with whom he created the science-fiction series 'Xan' (later retitled to 'Jhen') in 1978, and 'Kéos' in 1992. Pleyers drew 'Jhen' until 2000, when he was succeeded by Bernard Capo, and made three books of 'Kéos' until 1999.
In 1981, he additionally wrote and drew the science-fiction series 'Les Êtres de Lumière' for Métal Hurlant, that was collected in two books by Les Humanoïdes Associés. Between 1996 and 2002 he created the historical comic series 'Giovani' for Casterman, for which he did both art and scriptwork. In 2012, Images Innées published the adventure story 'Salt - Les Crânes de Cristal', that Pleyers and Paul Couturiau had originally created for Casterman in 2002.