Dave Sim (born 17 May 1956; Hamilton, Ontario, Canada)
Dave Sim created 'Cerebus the Aardvark', a rare example of a parody that outlasted the thing originally parodied (namely, 'Conan the Barbarian'). 'Cerebus the Aardvark', is the longest self-published comic series ever done. Well-drawn and humorously plotted, Cerebus has earned Sim a solid cult status since he started the series in 1977. The series has been regularly reprinted in fat volumes of more than 500 pages, published by Aardvark-Vanaheim, Sim's company that was run by his wife Deni Loubert. Sim completed his 'Cerebus' saga in 2004.

Sim was born in Hamilton, Ontario, but raised in Kitchener since he was two. A comics fan since early childhood, he published a fanzine called Comic Art News and Reviews, in which he interviewed famous artists. Prior to 'Cerebus', he did a newspaper strip called 'The Beavers' in the Kitchener-Waterloo Record, as well as some contributions to fanzines. The meter or so 'Cerebus' collections that now form Sim's oeuvre have made Sim - who typically refuses to let any publishing house earn his money - the king of self-published comics. For those ambitious enough to follow in his footsteps, Sim wrote the classic 'Cerebus Guide to Self-Publishing'.

In 2006, Sim began publishing an online comic book biography of Canadian actress Siu Ta, called 'Siu Ta, So Far'. In 2008, he published 'Judenhass', his personal reflection on the Holocaust. Another new project by Sim in 2008 was 'Glamourpuss', a comic book related to women's fashion.
Source: Lambiek

Gerhard (born 14 April 1959; Edmonton, Canada)
Gerhard is the professional name of a Canadian artist known for the elaborately detailed background illustrations in the comics series Cerebus the Aardvark.

Gerhard was born on April 14, 1959, in Edmonton. His association with Dave Sim's Cerebus began with issue #65 (August 1984), and continued through its conclusion in issue #300, in March, 2004. The series was written by Dave Sim, who also drew the foreground figures, and had worked on the self-published series largely solo for the first 64 issues. Gerhard jokingly described his job saying that he "draws tables and chairs behind an aardvark".

He is also fond of photography and sailing. Later issues of the comic book have covers based on his scenic photos.

Three years after finishing his work on Cerebus, Gerhard ended his professional and personal relationship with Dave Sim. Subsequently, Sim has been in the process of purchasing Gerhard's share of Aardvark-Vanaheim.

Although most associated with Cerebus, Gerhard has produced works for other publications, although mostly with Sim. In September 1994, however, he worked with Stephen R. Bissette on the cover to Bissette's Tyrant #1, and coloured Sim's back cover for Oni Press' Free Speeches #1 (August 1998).
Source: Wikipedia