Justin Paul Theroux was born at Sibley Memorial Hospital in Washington, DC and is the youngest of three children.
As the son of Eugene and Phyllis (an author - Giovanni's Light, California and Other States of Grace), nephew of Paul (also an author - Mosquito Coast, Half Moon Street), and cousin of Louis (a journalist - Weird Weekends), being part of the industry probably didn't come as much of a surprise to the Theroux family.
But it wasn't necessarily acting that he could see himself doing in the future - at one point he expressed to his mother that he planned on becoming a model.
Justin had difficulty in school at a fairly early age and was kicked out of several before he turned 14. He finally found a boarding school in Williamstown, MA where he felt more comfortable: he had to chop his own wood, cut the grass and make his own meals.
He wouldn't change schools again.
It was in Williamstown that he got his first taste of acting, performing in plays that toured to such places as DC and Mexico City.
After graduating from Bennington College in Vermont with a double major in visual art and drama, Justin entered the British American Drama Academy performing in the plays Much Ado About Nothing, Twelfth Night and A Midsummer Night's Dream.
Rather than immediately pursuing the theatre once he moved to New York City, Justin painted for a living, specialising in murals and even billboards, ads, and t-shirts.
He then became involved with the Theatre Workshop, Roundabout Theatre and Actor's Playhouse and first performed in the play Hide Your Love Away about the Beatles' manager Brian Epstein.
Soon he met his future friend Ben Stiller through Three Sisters fellow cast member Jeanne Tripplehorn.
Justin's first appearance in a film was in 1996 as Mark the Revolutionary in Mary Harron's I Shot Andy Warhol; he later appeared in her next film American Psycho in 2000 as the yuppie Wall Street friend of Patrick Bateman.
He is mostly recognised as his character Adam Kesher in David Lynch's Mulholland Dr. which is understandable, considering he wore his own sunglasses throughout the whole film and still continues to wear them in public to this day.
Not only has he worked in theatre and in film, but Justin had a recurring role in TV's The District and later Six Feet Under, Alias and Sex & The City.
Growing up in the DC punk scene greatly influenced what he listens to: Crass, Gun Club, Minutemen, Black Flag, Minor Threat, Fugazi, the Velvet Underground, Joy Division and Husker Du, among others.
More current bands that Justin listens to are the White Stripes, Deerhoof and the Yeah Yeah Yeahs.
From his musical tastes, nobody would guess that was actually him breakdancing as the Evil DJ in Zoolander - Ben Stiller discovered his talent when he saw him breakdancing at his wedding.
Currently, Justin lives with his two dogs Pooma and Loulou, enjoys riding his motorcycle and finding items in dumpsters to furnish his Greenwich Village apartment.