Giambrone was born in St. Joseph, Michigan to a family of Italian and German descent, and raised in Park Ridge, Illinois, where he attended Lincoln Middle School and Maine South High School. As of 2019[update], he is based in Los Angeles, but often visits Park Ridge.
He took up acting at the age of nine, starring in television commercials for McDonald's and Friendly's Restaurants, among others. His first film role was as Afro Boy in I Heart Shakey.
In September 2013, Giambrone gained the part of Adam Goldberg, the youngest child of Wendi McLendon-Covey and Jeff Garlin's characters, Beverly and Murray, in the ABC comedy series The Goldbergs. As of 2022, it is in its tenth season.

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