Rudman has been a Sesame Street performer since 1985—currently performing Cookie Monster (since 2001), Baby Bear and the right head of the Two-Headed Monster (since 1998). He has received four Emmy nominations as Outstanding Performer in a Children's Series for his work on Sesame Street. Rudman has also directed several web videos for Sesame Street such as "Cookie Monster Auditions for Saturday Night Live" and "Conversations with Bert". He has performed in numerous television shows and specials including Saturday Night Live, The Colbert Report, The Tonight Show with Jimmy Fallon, Jimmy Kimmel Live! and The Muppets, where he performed characters originally portrayed by Richard Hunt, such as Scooter, Janice, Bobby Benson and Wayne. His film credits include The Muppets Take Manhattan, Labyrinth, Teenage Mutant Ninja Turtles, A Muppet Christmas Carol, The Adventures of Elmo in Grouchland, The Muppets and Muppets Most Wanted. Following the departure of Steve Whitmire in 2016, he became Beaker's new performer in 2017.
Spiffy Pictures is a Chicago-based production company that was founded by David and Adam Rudman in 2003. The studio consists mainly of live-action television shows developed for networks such as Noggin, Disney Channel, the Nick Jr. Channel, and PBS.
In addition to his work on Sesame Street and with the Muppets, Rudman is co-owner of Spiffy Pictures where he co-created, executive produced, directed and performed in Jack's Big Music Show (Noggin), Curious Buddies (Nick Jr. Baby), Bunnytown (Disney Junior), Scooby-Doo! Adventures: The Mystery Map (Warner Bros.), Frankie and Frank (Nick Jr.), and Donkey Hodie (PBS Kids). He is the creator, executive producer, character designer, director and voice director of the animated series Nature Cat (PBS Kids), also voicing several characters including Leo the Mammoth, Prospector Jones, Nevin, and the Seeker.