Guy Counhaye studied Fine Arts in Verviers during the 60s. Between 1973 and 1984, he worked for Spirou magazine, starting with the comical space series 'Les Naufragés de l'Espace' with Raoul Cauvin. It was followed by 'Triton et Polaris' in 1976-1977 and the poetic series 'Geo et Tafta' in 1979-1981. His final work for the magazine was the gag series 'Bobul et Schnouf' in 1983-84, that was collected in book format by Éditions H. Dessain in 1987. This publisher had also released his comic 'Gorr, le loup' in the previous year.
With Éditions Le Lombard, he started the science fiction saga 'Le Professeur Stratus', his best known work that drew inspiration from H.G. Wells, Sir Arthur Conan Doyle and especially Jules Verne. Lombard published three books between 1990 and 1996, and a fourth in 2003. He also made two books of 'Les Voyages de l'Héloïse' for Lombard in 1999 and 2001.
Counhaye has additionally written various children's stories, that have been illustrated by Jean Lequeu and his wife Marie-José Sacré. He also makes expressionist paintings.