John Wallace Kilmer (born June 6, 1995) is an American actor known for starring in the 2013 film Palo Alto and for playing Pelle "Dead" Ohlin in the 2018 Norwegian black metal biopic Lords of Chaos, and for playing Ozzy Osbourne in Ozzy's "Under the Graveyard" video.
Kilmer, born to actress Joanne Whalley and Val Kilmer, was named after his mother. Jack grew up in Los Angeles and attended primary school at The Center for Early Education, where he met would-be filmmaker Gia Coppola (he was in the first grade; she was in the sixth).
They stayed in touch and, twelve years later, Coppola asked him to review her script for Palo Alto, a film adaptation of James Franco's book of the same name which she also planned to direct. She asked him to advise whether the dialog was an authentic reflection of "kids today". After he ran through a table read with her, she encouraged him to audition for one of the film's main roles, Teddy. Coppola filmed him as he read through the lines and this became his audition tape; he eventually won the role. After he was cast as Teddy, his father Val Kilmer joined the cast as the father of another character. Before filming Palo Alto when he was 16 years old, Kilmer had never acted before, and did not aspire to be an actor.