Justin Arnold is an American actor, born on the Upper East Side of Manhattan, New York City to magazine publishers Audrey Arnold and David Arnold, also a former child actor. He has dual citizenship in the United Kingdom through his father who is of British heritage, while his mother has Polish-Jewish ancestry. He attended The Dalton School where in Kindergarten he was scouted out of thousands of children to appear in HBO's Goodnight Moon & Other Sleepytime Tales (1999), talking about his dreams and introducing the title story. Justin attended Stagedoor Manor Performing Arts Training Center where he was roommates with Ansel Elgort. After graduating from the Drama program at NYU's Tisch School of the Arts, Justin moved to Los Angeles to pursue his acting career.