William Joshua Hopkins (born September 12, 1970) is an American actor and amateur musician. Hopkins was born in Lexington, Kentucky. He has participated in many TV series and films. He is the writer and performer of the song "Feigning Interest", a humoristic music video about dating that went viral in 2007. In 2015, he starred in the ABC thriller Quantico as Liam O'Connor.
Hopkins joined the fourth, and the last season, of New York Undercover in 1998. In 1999 Hopkins starred in Alanis Morissette's "Unsent" music video. Hopkins portrayed Paul Allen in the 1999 film Pirates of Silicon Valley, and Raymond Milbury on the television series Ally McBeal (2001 to 2002). He portrayed womanizer Charlie Babcock on the television series Pepper Dennis (2006). He later worked with his former Ally McBeal co-star Calista Flockhart when he had a recurring role on Brothers & Sisters. He also had a semi regular role as Peter Manning on the cancelled Fox drama Vanished (2006).
In 2005, Hopkins guest starred on Fox's hit show Bones as Temperance Brennan's former professor and lover, Michael Stires, in the episode "The Girl in the Fridge". Hopkins has also guest starred in CSI: Miami. Season 1 of the CBS series Cold Case saw Hopkins play the role of Assistant District Attorney Jason Kite. The show was especially noted for the on-screen chemistry between Hopkins' character and the character of Detective Lilly Rush, played by Kathryn Morris.
Hopkins starred in the 2008 CBS summer drama Swingtown as Roger Thompson. The series was originally intended for the Fall 2007 season, but was postponed due to the writer's strike. It has sparked some controversy for its portrayal of 1970s culture, including open marriage and key parties.
In 2009, Hopkins appeared as Dr. Noah Barnes in season 2 of ABC's Private Practice. He went on to play the character Grayson Ellis on the sitcom Cougar Town, which premiered September 23, 2009 on ABC and later moved to TBS. In 2015, Hopkins joined the main cast for Quantico playing the role of Liam O'Connor, a seasoned FBI agent working in the academy.
In 2018, Hopkins joined the main cast of Whiskey Cavalier in the role of FBI agent, Ray Prince.