Justin Theroux is an American actor director and screenwriter. He is best known for his work in Mulholland Drive, Inland Empire, Tropic Thunder, Iron Man 2, and Rock of Ages. In 2006, he directed his first film, Dedication, which premiered at the 2007 Sundance Film Festival. Theroux co-wrote the Ben Stiller-directed Oscar-nominated film Tropic Thunder, and also appeared in the behind-the-scenes mockumentary Tropic Thunder: Rain of Madness.
In 2008, Theroux played John Hancock in the HBO miniseries John Adams. He also played Justin in Parks and Recreation. In 2009, Theroux made up part of the voice cast for Call of Duty: Modern Warfare 2. Also, Theroux wrote the screenplay for the 2010 film Iron Man 2. In 2010, Theroux was announced to write and direct a proposed sequel to the 2001 film Zoolander. He starred in the 2012 comedy Wanderlust, playing the leader of a hippie commune. He also stars in the HBO television drama The Leftovers.
Justin will play the role of Tom Watson in the upcoming film adaptation of the best selling novel, The Girl on the Train.