He is currently a member of the underground record label Definitive Jux and NY hip-hop syndicate Stronghold. In addition to releasing four LPs and one EP, he has appeared on many other rappers' records, including Aesop Rock and Immortal Technique, and has done work with such artists as Percee P and Irish HipHop due Messiah J & The Expert. Immortal Technique is reputed - by Walz himself - to be the only emcee who can hold his ground against Walz in a freestyle battle.