In The Muppets, Jeong plays the "Punch Teacher" Host. He also appeared in the Never-Ending Mahna Mahna Phenomahna. In August 2015, he posted a photo of himself to Twitter with Pepe the King Prawn, behind-the-scenes filming a promo for The Muppets.
Among Jeong's other credits are the feature films Transformers: Dark of the Moon, The Hangover: Part II, Despicable Me (with Jason Segel) and the Twilight Saga spoof Vampires Suck. Television appearances including voicing Dr. Perlmutter on American Dad!, The Office, and MADtv.