<P> Weston was born Michael Rubinstein in New York City, the son of actors Judi West and John Rubinstein, the grandson of piano virtuoso Arthur Rubinstein and the great - grandson of conductor Emil Młynarski, the founding conductor of Warsaw Philharmonic Orchestra and principal conductor of the Scottish Orchestra . </P> <P> He holds a degree in Theater and Arts from Northwestern University . In 2000 he changed his surname to "Weston" as there was already a "Michael Rubinstein" in the Screen Actors Guild . He has been married to musician Priscilla Ahn since 2010 . </P> <P> Weston is a good friend of actor Zach Braff and has appeared in three features with him, Garden State, Wish I Was Here and The Last Kiss, and as a guest star on Braff's television show, Scrubs . Weston has also appeared as Simon Marsden, Olivia Benson's half - brother on Law & Order: Special Victims Unit . </P> <P> Weston appeared in the fifth season of House as a private investigator named Lucas Douglas hired by Dr. Gregory House; he reappeared in season six . Series creator David Shore planned a spin - off show with Weston's character as the lead in 2008, but the show never went into production . </P>

Who plays olivia's brother on law and order svu
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