[1] His father, Billy Koch, is from a Jewish Eastern European background; he is the founder and managing partner of the horse racing club Little Red Feather and previously worked in the film industry in the visual effects department.
[10][7] Koch attended Calabasas High School, where he participated in theater and worked in various stage adaptations such as West Side Story and A Midsummer Night's Dream.
[16] He later appeared in A New York Christmas Wedding (2020), playing Azrael Gabison, a guardian angel who shows a woman an alternate version of her life.
[20] That same year, he appeared in the Blumhouse Productions slasher film They/Them, playing Stu, a closeted gay jock who attends an LGBTQ conversion therapy camp.
[23][24] His performance received critical acclaim, particularly in the fifth episode, "The Hurt Man", which is a 30-minute long take of Erik detailing the sexual abuse he suffered from his father.
[29] In November, he appeared in the short film Togetherness, as part of a campaign by fashion house Yves Saint Laurent.