Thomas Horn first gained national attention at age 12 in July 2010 when he made headlines for winning first place on Teen Jeopardy with $31,800 in prize money. Movie producer Scott Rudin saw Thomas on the show and suggested him to director Stephen Daldry, who was searching for the lead for his movie Extremely Loud and Incredibly Close.
On Thomas's first day of grade eight, his parents received a call from a casting agent asking if their son wanted to audition for a major motion picture. He landed the role of Oskar, the nine-year-old son of characters played by Tom Hanks and Sandra Bullock.
Thomas is fluent in English and Croatian and has studied Spanish and Mandarin. He enjoys reading novels, National Geographic and atlases in his spare time.