Stuart Immonen is a Canadian comic book artist born in Toronto who has worked for both DC and Marvel Comics as well as for Top Cow and Image Comics. He is an acclaimed artist said to have a simple style but is very good at showing what is happening on the page with facial expressions and characters body languages. Stuart Immonen is also very good at drawing very varied subject matter from Nazis to Sea monsters as is shown in the Fear itself miniseries. He is married to comic book writer Kathryn Immonen who he has collaberated with on more than one publication. He often works with Brian Michael Bendis and he is often inked by Wade Von Grawbadger. Stuart Immonen is best known for his work on Nextwave, Ultimate X-Men, The New Avengers and Ultimate Spider-Man.

Stuart Immonen studied at Toronto's York University, pursuing a career in art. In 1988, he self-published a series called Playground; it was his first published work. He worked at several smaller comic book companies including companies like Top Cow and Image Comics before being hired by DC Comics and Marvel Comics in 1993. There he has drawn a variety of high profile characters such as Superman, Hulk, the Legion of Super Heroes, and the X-Men. His work includes titles such as Ultimate Fantastic Four and Ultimate X-Men (54-65) with writers Warren Ellis and Brian K. Vaughan, as well as a 12-issue run on Nextwave. In 2000, Immonen was one of the founders of Gorilla Comics, a company formed with Mark Waid, Kurt Busiek and several others. Stuart Immonen and Busiek collaborated on the Shockrockets limited series and the Superstar: As Seen on TV one shot but the company folded after a short time. Immonen ended his ongoing involvement with the Superman franchise with the Superman: End of the Century graphic novel in 2000 but returned to the character for the Superman: Secret Identity in 2004.

In 2005, Stuart Immonen published 50 Reasons to Stop Sketching at Conventions, a tongue-in-cheek handbook for convention etiquette, the series is an 80 page black and white pocketbook collecting the irreverently satirical series of webcomics, and it exposes the peculiarly strained relationship between creator and fan. Besides self-publishing, Immonen had also maintained a webcomic called Never as Bad as You Think which is co-authored by his wife, Kathryn Immonen. The series didn't focus on the traditional three-act structure story but rather a collection of character pieces that inter-connect throughout the series. In 2006, Immonen was the new artist on Marvel Comics, Ultimate Spider-Man starting with issue 111 ending on issue 133; he then departed from the series and began working on New Avengers, starting on issue 55 through to 64. In 2010 Immonen pencilled the first seven issues of the New Avengers as part of the Heroic age relaunch written by Brian Michael Bendis.

In 2010, Stuart Immonen released Moving Pictures another webcomic co-authored by Kathryn Immonen, which was later turned into a graphic novel like Never as Bad as You Think which is currently been published by Boom Studios . The story was set in the World War 2 era, concerning the widely reported Nazi pillaging of much of Europe's art collections and an atypical romance between two people riding that roller-coaster. The same year he won the Joe Shuster Award for Outstanding Artist. In 2011 Immonen illustrated Marvel's Fear Itself miniseries, which formed the core of a company-wide crossover storyline of the same name. In November 2012 he and writer Brian Michael Bendis started the series All-New X-Men. He is now working on All New X-Men part of the Marvel Now! relaunch with Brian Michael Bendis the series will focus on the original five X-Men coming forward in time to the present post Avengers vs X-Men world. Stuart Immonen is currently credited with some or all of the artwork in 657 separate Comic Book issues.