Born in October 1970 in Saint-Loup in French-speaking Switzerland, Bertschy became a graphic designer and worked in that capacity for Philip Morris for 8 years.
After winning the "new talent" competition of the Sierre comic book festival in 1999, he started out professionally in TCHÔ ! magazine, illustrating a comic strip called Jimmy Brocoli.
It was then that Editions Glénat offered him a chance to create a series of his own.
This resulted in the creation of Smax, which appeared monthly in TCHÔ !
Then, in February 2001, Bertschy launched his comic strip Nelson in Le Matin (no. 1 daily newspaper in French-speaking Switzerland), a phenomenon that has now reached 3,500 strips.
In 2018, the first compilations of the series (published by Dupuis) were released in English by Europe Comics.