Hervey was born in Los Angeles, the son of Marsha, a talent agent, and Alan Hervey, a retail sales manager. In his early career, Hervey had small roles in films including Back to the Future, Pee-wee's Big Adventure, Meatballs Part II, Police Academy 2: Their First Assignment, and had a recurring role as Charlie in the final season of Diff'rent Strokes. His big break came as a cast member of the successful family dramedyThe Wonder Years, as the older brother of Fred Savage's character. He ranked at #71 on VH1's 100 Greatest Kid Stars for the role.
Hervey's role on The Wonder Years led to a later guest appearance on the animated show Justice League Unlimited. He appeared alongside Savage in the episode "Hawk and Dove", where Hervey provided the voice of the younger, more passive brother Don Hall/Dove, opposite Savage's role of the older and more aggressive brother, in a role reversal from The Wonder Years. The original idea had been to cast Hervey as Hawk in tribute to his role as Wayne Arnold, until both he and Savage felt the opposite roles were better challenges.
Hervey was the voice of Eddie McDowd on the Nickelodeon series 100 Deeds for Eddie McDowd for season two. He made a brief appearance in the 1993 adventure game Return to Zork as the troll king.[citation needed]

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