Liam was born in Cleveland, Ohio. He has performed in film, commercials, radio and in nearly 40 plays. His mother, Wendy Koeth is the producer and director of Stagecrafters Youth Theatre and his father, Jamie Koeth, is a professional actor, acting teacher and director. Liam enjoys singing, skiing, guitar, trumpet, Star Wars & Minecraft. He has earned his 2nd Degree Blackbelt in Tae Kwon Do. He has two Rag Doll cats named Fluffy & Pippin. He recently played Dave Dahmer in My Friend Dahmer opposite Anne Heche, Ross Lynch and Alex Wolff directed by Marc Meyers.