Matthew Brandon Ross is an American actor, director, and screenwriter. He is best known for his roles as Gavin Belson in the HBO series Silicon Valley, Glenn Odekirk in The Aviator, and Luis Carruthers in American Psycho. Ross garnered critical acclaim for his role as Alby Grant in the HBO series Big Love for five seasons. He was also Eddie Scott in the 2005 film Good Night, and Good Luck, for which he was nominated for a Screen Actors Guild Award for Outstanding Performance by a Cast in a Motion Picture. In 2011 and 2015, he played Charles Montgomery in the first and fifth seasons of FX's anthology series American Horror Story. He wrote and directed the feature film Captain Fantastic, starring Viggo Mortensen, for which he won Un Certain Regard at the 2016 Cannes Film Festival. Before that, Ross made seven short films, including The Language of Love, which premiered at the Sundance Film Festival. His feature film directoral debut, 28 Hotel Rooms, premiered at the Sundance Film Festival in 2012.