Fat Jon the Ample Soul Physician (born John Marshall) is an American hip-hop producer and emcee from Cincinnati, Ohio and one of the four members of Five Deez, alongside Pase Rock, Sonic, and Kyle David (a.k.a. Chilly Most).

He debuted in 1998 for contributing to Doseone's album 'Hemispheres' as a producer.

He has gained fame for his work on the Samurai Champloo soundtrack alongside Force of Nature, Nujabes, and Tsutchie. He currently resides in Germany. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.