"One episode, I lost my tooth, and me and Big Bird had to go through Sesame Street and try to find it," Carey remembers.
While a high school student, Carey followed his passion for rap and hip-hop, doing his best to persue a career path in music, using his talents to propel him forward.
Early in his career, he formed a DJ/rapper group called The Gravediggaz (not to be confused with RZA's group of the same name) with Roc Raida of X-Ecutioners. He also collaborated with hip-hop legends like Kool G Rap and KMD. In 1993, Grimm placed at the World Supremacy Battle, already known as an experienced battle rapper. That year, he released his first 12" single, So Whatcha Want Nigga? and performed at the Jack The Rapper convention on Execution Night, sharing the stage with Lady of Rage, Tupac, and Dogg Pound, in Atlanta. Grimm was soon approached by several major labels.
Grimm founded label Day By Day Entertainment in the late-1990s, releasing the work of independent artists, including MF DOOM’s Operation: Doomsday. At around the same time, he put together his Godzilla-inspired MC collective, the Monsta Island Czars.
MF Grimm has the alias GM Grimm, for Grand Master Grimm. He stated in an interview that "GM is me and Roc Raida," so it reads, "Grand Master Roc Raida and Grand Master Grimm.
In a November 2007 interview on "Fresh Air," Grimm said he had ghost written "way before prison" during his teens when he "was 14, 15, 16, 17." He admitted the reason he doesn't mention names is that the artists would get angry because they would seem less authentic if they hadn't written the raps themselves. Grimm said ghost writing doesn't bother him because it was something he chose to do and knew the outcome of it.
In 2008, MF Grimm, under his little known alias of Percey Carey, was nominated for two Eisner Awards for his graphic novel series, Sentences, Best Reality Based Work and Best Lettering. He was also nominated for, and won, two Glyph Awards for Best Cover and Story of the Year.
MF Grimm has recently appeared on National Public Radio to relate his life story and future plans.