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evidence: Matthew Brandon `` Matt '' Ross -LRB- born January 3 , 1970 -RRB- is an American actor , director and screenwriter .. He wrote and directed the feature film Captain Fantastic , starring Viggo Mortensen , for which he won Un Certain Regard -LRB- recognition of young talent -RRB- at the 2016 Cannes Film Festival .. Captain Fantastic. Captain Fantastic ( film ). Viggo Mortensen. Viggo Mortensen. Un Certain Regard. Un Certain Regard. 2016 Cannes Film Festival. 2016 Cannes Film Festival. Before that , Ross made seven short films , including The Language of Love , which premiered at the Sundance Film Festival .. Sundance Film Festival. Sundance Film Festival. As an actor , Ross is best known for his roles as Gavin Belson in the HBO series Silicon Valley , Alby Grant in the HBO series Big Love , Glenn Odekirk in The Aviator , and Luis Carruthers in American Psycho .. Silicon Valley. Silicon Valley ( TV series ). Alby Grant. Alby Grant. Big Love. Big Love. Glenn Odekirk. Glenn Odekirk. The Aviator. The Aviator ( 2004 film ). American Psycho. American Psycho ( film ). 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 .. Screen Actors Guild Award for Outstanding Performance by a Cast in a Motion Picture. Screen Actors Guild Award for Outstanding Performance by a Cast in a Motion Picture. He also directed the feature film 28 Hotel Rooms , which premiered at the Sundance Film Festival .. Sundance Film Festival. Sundance Film Festival. 28 Hotel Rooms. 28 Hotel Rooms. In 2011 and 2015 , he played Charles Montgomery in the first and fifth seasons of FX 's anthology series American Horror Story .. Charles Montgomery. Charles Montgomery ( American Horror Story ). FX ( network ). anthology. anthology. American Horror Story. American Horror Story. He is married to the writer Phyllis Grant , with whom he has two children  : Isabel `` Bella '' and Dashiell `` Dash '' Ross .