Christopher Lowell is an American actor. He is best known for playing the roles of Stosh “Piz” Piznarski in the television series Veronica Mars (2006–2007), William “Dell” Parker in the television series Private Practice (2007–2010), and Sebastian “Bash” Howard in the television series GLOW (2017–2019). He has also appeared in films, notably Up in the Air (2009), The Help (2011), and Promising Young Woman (2020), all of which were nominated for the Academy Award for Best Picture. Lowell made his directorial debut with the film Beside Still Waters (2013), which he also co-produced and for which he co-wrote the screenplay.