Omar Metwally (born April 10, 1974) is an American actor. He is best known for his portrayal of Dr. Vik Ullah in the Showtime television series The Affair, as well as for Rendition (2007), Munich (2005), and Miral (2010). He has also appeared in the roles of Dr. Fahim Nasir in Non-Stop (2014), Agent Santiago in the USA Network television series Mr. Robot, and CIA agent Matt Edwards in the Bourne spin-off television series Treadstone.