Tenas is the pseudonym for Louis Santels (also spelled as Louis Saintels or Santel, but Santels is most likely the correct spelling). He was a member of La Mine Souriante, the association of humorous artists founded by Marcel Antoine in 1928. He began his career drawing in a style inspired by American animated cartoons, but he later also turned to a more realistic style. He made several illustrations for Le Moustique in 1945, and was one of the main contributors to Collection Tommy, the magazine published by Guy Lambert in Brussels shortly after the Liberation. He teamed up with Rali with whom he founded an art studios, that was later also joined by Tibet and André-Paul Duchateau.
The studios provided the core of the comics published in the Belgian magazine Bravo! until 1950, replacing the original team Laudy-Jacobs-Vandersteen. Tenas and Rali drew several series together in varying styles, including 'Cyprien Bravo', 'Phill Blue-Eyes', 'Capitaine Hardell', 'Ivanhoé' and, most nobably, 'Morgana' (1944-1946). Tenas and Rali, accompanied by Duchateau, additionally made 'Le Triangle de Feu' for Spirou magazine in 1952.
Tenas' studio was also involved in the launch of the Belgian Mickey Magazine in 1950, and later Le Journal de Mickey in France. Tenas was the first artist to draw Disney characters for an original French publication when he illustrated the cover of the magazine's first issue.
He subsequently made numerous illustrations for the magazine, as well as Disney-based material and the series 'Onkr' (with scripts by Yvan Delporte). He also made covers and the title comic of the Dutch comics magazine Pep, the latter with André-Paul Duchateau, through the Opera Mundi agency between 1962 and 1964. Tenas additionally worked for Heroic Albums and Story.