Jonas Geirnaert studied animation at the KASK in Ghent. He made his first film in 2002, called 'The All-American Alphabet'. In May 2004 he won the jury prize for shorts at the Cannes Film Festival with his animated short 'Flatlife'. Geirnaert is part of comedy group Neveneffecten, that participates in several satirical TV productions through Woestijnvis, including 'Neveneffecten' (2005) and 'Basta' (2011).
His simplistic character 'Kabouter Wesley' first appeared as a comic strip in Humo magazine between 2008 and 2010. The surrealistic and absurd strips were also adapted into short animated films that were included in the Flemish TV show 'Man Bijt Hond' in 2009 and 2010. The character also became a YouTube hit in Holland and his films were also featured on Comedy Central. A book collection of the Wesley strips from Humo was published in 2010.