Lang has worked as a voice director for clients including Cartoon Network, EWAM, Sony, Bang Zoom! Entertainment, Technicolor, PCB Productions, Microsoft, Xbox 360, Code Masters, HBO and Warner Brothers. A two-time Emmy Award–winning voice actor (first for his portrayal of Professor Behdety in the 2003/2004 season of Tutenstein, then again as The Doorman and his dog Hundley on the 2009/2010 season of Curious George), he has been in hundreds of productions ranging from original animation, anime, video games, celebrity voice matching, and movie trailers.
He is well known for playing the voice of Han Solo for Lucas Arts, Doctor Neo Cortex in Crash Twinsanity, Crash Tag Team Racing, Crash of the Titans and Crash: Mind over Mutant (replacing Clancy Brown), The Doorman and Hundley in Curious George, Dr. Polaris, Batman as Dick Grayson in Batman: The Brave and the Bold, Ecliptor in Power Rangers: In Space, the Wolf Duke Org Zen-Aku in Power Rangers: Wild Force and Captain Cold, General Nardoc, multiple characters in Justice League Unlimited, and Calypso in the Twisted Metal franchise. He was the announcer and does all the bits, and celebrity voice matching in Martin Short's talk show Primetime Glick. He is also known worldwide for his anime voice work playing roles such as Kenshiro from Hokuto no Ken Fist of the Northstar, Sanosuke Sagara from Rurouni Kenshin, Goemon Ishikawa XIII in Geneon's dub of Lupin III part two, and Crim from .hack//SIGN.