Lewis Trondheim (Laurent Chabosy), born 11 December 1964, is an extremely prolific French cartoonist and one of the founders (in 1990) of the independent publisher L'Association. Both his silent comic La Mouche and Kaput and Zösky have been made into animated cartoons. He explained his choice of pseudonym after the Norwegian city of Trondheim as follows: "As a last name I wanted to use a city's name, but Lewis Bordeaux or Lewis Toulouse didn't sound so good. Then I thought about this city, Trondheim… Maybe someday I will publish an album under my real name, in order to remain anonymous."
In 2004, after a long and intensive period during which he steadily released new books at a frantic pace, Lewis Trondheim announced he was more or less retiring from the world of comic strips, stating he did not want his passion to become a "job". He did draw and write a few stories within the following year, including a book reflecting on his decision to slow down, though the releases occurred at a much slower pace.
It has long been speculated he used this time partly to create another ambitious work, Le blog de Frantico, which was a comic strip blog published daily on the web for a whole year under the Frantico pseudonym. In interviews and on his web sites, Trondheim alternately admits and denies having written Le blog de Frantico, though another author, Sébastien Lesage eventually stepped up and claimed to be the real author, saying he had asked Trondheim to help him maintain the mystery. To this day however, the true identity of Frantico remains unconfirmed.
Source: Wikipedia, "Lewis Trondheim", available under the CC-BY-SA License.