International Journalism Festival, 2011
Fiore lives in San Francisco, California, and his cartoons have appeared in numerous American papers and a number of websites. He studied political science at Colorado College and was a staff cartoonist for the San Jose Mercury News. He left newspapers for animated online comics in 2001, and he currently makes animated editorial cartoons for his website markfiore.com, where he also sells DVDs of his cartoons. He is a member of the Association of American Editorial Cartoonists.
Fiore's comics were included in Ted Rall's Attitude 3: The New Subversive Online Cartoonists, along with other web-comics such as Dinosaur Comics, Diesel Sweeties, Fetus-X, and The Perry Bible Fellowship. In their review of Attitude 3, the American Library Association's Booklist called Fiore's cartoons a standout for their "unique and personal" vision. He won a Pulitzer Prize in 2010, the first ever for his genre of editorial cartoons.
Recurring characters 
In some of his Flash cartoons, Fiore makes use of several characters more than once. Some of the characters include:
- Dogboy & Mr. Dan—An anthropomorphic dog chats with his friend Mr. Dan, who is rabidly conservative.
- Buster Bunker The Friendly Nuke—a nuke
- Knuckles—a slow man in an executioner's mask who loves torturing Guantanamo prisoners
- Flamey McGassy
- Ouchie—a talking bandaid
- Captain Killmore
- Snuggly the Security Bear—a rather sadistic teddy bear who puts a positive spin on domestic spying and wiretaps
- Right-wing Ralphie—a squat lawyer with pixie wings who fights for homosexuals to gain restitution for being "forced" into marriage. After the passage of California's Proposition 8, he celebrates the "protection of heterosexual marriage". He is a caricature of Ralph Reed, the former Religious Right leader.
- Buzzie the Fly—a Cajun fly who updates the nation on the New Orleans reconstruction, especially the living conditions of Hurricane Katrina refugees
Fiore was awarded an Online Journalism Award by the Online News Association and the Columbia University Graduate School of Journalism. He won the National Cartoonist Society New Media Award for 2001 and 2002, and was nominated for the same award in 2000. He also won the 2005 Robert F. Kennedy Journalism Award in the category of cartoons.
Fiore won the 2010 Pulitzer Prize for Editorial Cartooning. He is the first cartoonist to win an editorial cartooning Pulitzer for an entry of entirely online animations (his work appears on SFGate.com, the San Francisco Chronicle Web site). The Pulitzer Prize committee, in a statement, said that "his biting wit, extensive research and ability to distill complex issues [on the Web site] set a high standard for an emerging form of commentary."
- Summers, Nick (December 18, 2006). "Satire: Singing a Different 'Toon'". Newsweek, Pg. 14.
- Rall, Ted (2006). Attitude 3: The New Subversive Online Cartoonists, New York: Nantier, Beall, Minoustchine. ISBN 1-56163-465-4.
- Flagg, Gordon (August 2006). "Attitude 3: The New Subversive Online Cartoonists". Booklist, Pg. 23.
- The 2010 Pulitzer Prize Winners: Editorial Cartooning. The Pulitzer Prizes.
- Cavna, Michael. "2010 PULITZERS: SFGate's Mark Fiore wins cartooning's award". The Washington Post, April 12, 2010. Accessed April 29, 2010.
- "Animated cartoons win Pulitzer for Mark Fiore". forum.bcdb.com, April 13, 2010.