Thomas Horn was born in 1997, the elder of two boys, to physician parents. Raised in San Francisco, when he was in the sixth grade he entered the National Geographic Geography Bee, coming third and was also placed in the top four on two further occasions. Prior to his film debut his only acting experience had been as the old Grasshopper in a school production of 'James and the Giant Peach'. Chosen from over three thousand boys for the role of Oskar in 'Extremely Loud and Incredibly Close' he was awarded Best Young Actor at the seventeenth annual Critics Choice awards.

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