Deep smooth voice
Younger brother of fellow second-generation performer Mercedes Kilmer. Their parents are Val Kilmer and Joanne Whalley; aptly enough, Jack and his sister have dual American and British citizenship.
He and his father Val Kilmer have both appeared in films directed by Shane Black: Val in Kiss Kiss Bang Bang (2005) and Jack in The Nice Guys (2016).
His full name is John Wallace Kilmer, after his English actress-mother.
He met Gia Coppola in school when he was in the first grade and she was in the sixth. She would later direct him in Palo Alto (2013).
He had never acted prior to being cast in Palo Alto (2013).
Despite being the son of two actors, he had never intended to pursue acting before being cast in Palo Alto (2013).
Played a young Ozzy Osbourne in Ozzy's "Under The Graveyard" video (2020).