<P> Miller appeared frequently as a member of the "round table" on Chelsea Lately . He appeared as Marmaduke Brooker in Carpoolers, which ran for 13 episodes on ABC in 2007--2008 . In 2012, he voiced Robbie Valentino on the Disney channel cartoon Gravity Falls . On December 13, 2010, October 28, 2011, and June 14, 2012, he performed stand - up on Conan . On November 15, 2011, his stand - up special No Real Reason premiered on Comedy Central . In 2011, he hosted a special called Mash Up, which was picked up in 2012 for a full season by Comedy Central . He starred in the Fox TV series The Goodwin Games as Jimmy Goodwin . </P> <P> Miller starred in the HBO sitcom Silicon Valley, which has been met with widespread critical acclaim and he won the Critics' Choice Television Award for Best Supporting Actor in a Comedy Series in 2015 . In May 2017, Miller and HBO jointly announced that Miller will not be returning for the 5th season of Silicon Valley . </P> <P> As a commercial actor, he voices a talking ball of mucus in commercials for Mucinex and stars as Greg the Genie in a promotional campaign for Slim Jim meat snacks . </P> <P> In Miller's film debut, Cloverfield, he appeared onscreen for only a few minutes, but his voice was heard in almost every scene as the character who videotaped most of the events depicted . In 2009, he played Cessna Jim in The Goods: Live Hard, Sell Hard and the dim - witted grindcore musician Rory in Mike Judge's comedy Extract . In 2010, he co-starred in She's Out of My League as Stainer, played Brian the Concierge in Get Him to the Greek and appeared in a supporting role in the film Unstoppable . </P>

Who does the voice of the mucus in the mucinex commercial
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