Baker was born in Bloomington, Indiana to Buddy and Nancy Baker (b. Dec 21, 1935 – d. Apr 24, 2007), and grew up in Greeley, Colorado. He started performing at age nine and steadily worked in musicals, operas, plays and stand-up. As a child he was a fan of Star Trek, Star Wars, Frank Zappa and the Planet of the Apes, and also liked insects, arthropods and dinosaurs. He graduated from University High School in 1981 and received a Boettcher Scholarship.

Baker moved to Orlando in 1989 to work on an improv sketch comedy show titled “The Anacomical Players” at EPCOT Center’s Wonders of Life pavilion and joined various projects for Disney and Universal Studios. His first major experience on national television was on the Nickelodeon game show Legends of the Hidden Temple, where he was not only the announcer, but also the giant talking rock-god Olmec. He portrayed Olmec with a “big, booming, loud, god-like voice”. During parts of the show, he would narrate a legend, and then ask the kid contestants related trivia questions. The show lasted three seasons and 120 episodes. When host Kirk Fogg moved to Los Angeles, he was encouraged to move there as well. In 2016, he and Fogg reprised their roles for a live action television movie adaptation of the show.

Baker met his wife, Michelle, when they were doing children’s theatre at the Colorado Springs Fine Arts Center. They were married in 1990 and have two daughters: Josie and Cora. They live in the Los Angeles area. Outside of voice acting, Baker enjoys photography, taking pictures of mostly small flowers and insects.

Baker moved to Southern California in time for the 1994 Northridge earthquake. He got involved in voice-over work; his first major character was Cow & Chicken’s dad in the Cow & Chicken and I Am Weasel cartoons. His first feature film voice-over was on the basketball/Looney Tunes-themed movie Space Jam where he voiced Daffy Duck, Taz and Toro. He did voice work for various episodic and recurring cartoon characters on The Real Adventures of Jonny Quest, Johnny Bravo, Dexter’s Laboratory, SpongeBob SquarePants and The Powerpuff Girls. He voiced starring characters Og in Mike, Lu & Og and Bagheera in the second season of Jungle Cubs. In 2001, he added voice roles for Sanjay, Binky and other characters for The Fairly OddParents and co-starred as Mandy’s father on Billy and Mandy. He had a lead role as Numbuh 4 in Codename: Kids Next Door.

On the live-action front, he became the co-host and announcer for the game show Shop ’til You Drop which spanned several hundred episodes when it resumed broadcasting on the Family Channel and on the Pax television network, until a series retool in 2003; it was produced by Stone Stanley Entertainment, which had earlier co-produced Legends of the Hidden Temple. He also had an on-screen recurring role as Phil Berg in the Nickelodeon sitcom series The Journey of Allen Strange where he plays a crazed journalist who tries to expose Allen’s identity as a space alien.

Baker would continue to do regular voice-over roles. In 2005, he landed a role as Klaus Heissler, an Olympic ski jumper from Germany who was body-swapped into a goldfish, in the primetime cartoon sitcom American Dad!, which has run over fifteen seasons on Fox and TBS and on DVD. In an interview with Pop Break, Baker said that he liked playing Klaus because he loves the German language, the part was well written, and it is light duty on his voice. He compared the table reads to being on The Carol Burnett Show. He participated in American Dad panels at San Diego Comic-Con 2010 2012, and 2014; and the New York Comic-Con in 2014. His voicing of council member Tarrlok in Korra garnered a nomination for the Behind the Voice Actors (BTVA) Voice Acting Award in 2012. In addition to television shows, Baker voiced characters in many animated and live action animation films, including some of the classic ghost monsters in Scooby-Doo 2: Monsters Unleashed, and Maurice in Happy Feet. He also had roles in the Scooby-Doo! Mystery Incorporated TV series and its direct-to-video releases.

In 2007, Baker got the role of Perry the Platypus in the Disney series Phineas and Ferb. At the San Diego Comic-Con 2013 panel, Baker mentioned that when he auditioned, he was asked to provide three different creature sounds, regardless of whether it actually sounded like a platypus, of which one was selected as Perry’s characteristic sound. Perry has become a breakout character for the series, with Baker appearing at multiple Comic-Con panels for the show. In 2014, Perry was nominated for a Nickelodeon Kids’ Choice Award for Best Animal Sidekick. Coincidentally, another one of Baker’s voiced characters, Waddles the pet pig in Gravity Falls, was nominated for the same category.

Baker was involved in the Star Wars: The Clone Wars film released in 2008 and its television series afterwards which ran for seven seasons. He provided the voices for not only the characters Captain Rex and Commander Cody, but also all the supporting Clone Troopers, the last of which he received an Annie Award nomination for Voice Acting in a Television Production in 2012. He reprised the role of Captain Rex in Star Wars Rebels, beginning with its second season. He also provided the voice of Boba Fett for Star Tours – The Adventures Continue. In the 2011 Family Guy episode “It’s a Trap!”, a parody of the Star Wars film Return of the Jedi, he voiced Klaus as Admiral Ackbar.

In the video game world, Baker reprised his roles in Cartoon Network and Nickelodeon’s multitude of show-related game releases. He also voiced Gravemind in Halo 2 and Halo 3, and the title character Joe in the Viewtiful Joe series released from 2003 to 2005. He provided the creature sounds for the Spore video game which allows players to create and evolve their own creatures. At San Diego Comic-Con 2008’s opening night, he was a featured performer at the Video Games Live concert, where he voiced characters from Gears of War and other series. He provided voices for two Blizzard Entertainment characters – Murky, a baby murloc in Heroes of the Storm, and Hammond, a genetically engineered hamster in Overwatch. He is also the voice of Atlas and P-body in Portal 2, released in 2011.

In 2014, Baker continued participating in American Dad, Gravity Falls and a fourth season of The Legend of Korra. He voiced Dopey in the Disney XD series The 7D; and Fish, Wheels and Bucket in The Boxtrolls film, in which he was nominated for an Annie Award for voicing Fish. In the Lego Batman 3: Beyond Gotham video game, he voiced Brainiac. He voiced George Clooney and his dog in “The Animated Episode” of the TV Land series Hot in Cleveland.