Question: Gossip girl who is keith van der woodsen?

Disambiguated questions and answers:
context: Throughout the episode, dialogue and objects prompt Lily to recall the events of her own first arrest. During flashbacks, a seventeen-year-old Lily Rhodes (Brittany Snow), having deliberately gotten expelled from The Thacher School in Ojai, California travels to Malibu, California to meet with her father, Rick Rhodes (Andrew McCarthy), the wealthy owner of Rhodes Records. Sadly for Lily, Rick already phoned her mother CeCe, who drove to Malibu from Montecito to deal with Lily. When Rick rejects the idea of Lily living with him in Malibu, Lily decides to find her sister Carol (Krysten Ritter) rather than move in with CeCe, whom Lily detests. Carol, an aspiring actress, had rejected the Rhode's upscale life and moved a year earlier to the San Fernando Valley. While searching for Carol, Lily meets Owen Campos (Shiloh Fernandez), who takes her to a club where they find Shep, Owen's musician friend, and Carol. Carol and Shep are in the midst of a dispute with Keith van der Woodsen (Matt Barr), the rich, antagonistic director of Shep's music video in which Carol stars, and are headed to his party to confront him for raising his price and holding the video hostage. When Lily asks why Carol does not simply use their father's company, Carol insists she does not want anyone to know of their privileged background. When the antagonism escalates to a fight at the party, security arrests Owen and Lily although Carol and Shep manage to escape. From jail, Lily calls CeCe. CeCe calls her daughters irresponsible. Carol, who has come to pay Lily's bail, overhears Lily defend Carol's lifestyle. Carol takes the phone from Lily, informs CeCe that Lily will be moving in with her, and takes Lily back to the city.
question: Who is the actor of Keith van der Woodsen in Gossip Girl?
short_answers: Matt Barr
wikipage: Valley Girls
context: Throughout the episode, dialogue and objects prompt Lily to recall the events of her own first arrest. During flashbacks, a seventeen-year-old Lily Rhodes (Brittany Snow), having deliberately gotten expelled from The Thacher School in Ojai, California travels to Malibu, California to meet with her father, Rick Rhodes (Andrew McCarthy), the wealthy owner of Rhodes Records. Sadly for Lily, Rick already phoned her mother CeCe, who drove to Malibu from Montecito to deal with Lily. When Rick rejects the idea of Lily living with him in Malibu, Lily decides to find her sister Carol (Krysten Ritter) rather than move in with CeCe, whom Lily detests. Carol, an aspiring actress, had rejected the Rhode's upscale life and moved a year earlier to the San Fernando Valley. While searching for Carol, Lily meets Owen Campos (Shiloh Fernandez), who takes her to a club where they find Shep, Owen's musician friend, and Carol. Carol and Shep are in the midst of a dispute with Keith van der Woodsen (Matt Barr), the rich, antagonistic director of Shep's music video in which Carol stars, and are headed to his party to confront him for raising his price and holding the video hostage. When Lily asks why Carol does not simply use their father's company, Carol insists she does not want anyone to know of their privileged background. When the antagonism escalates to a fight at the party, security arrests Owen and Lily although Carol and Shep manage to escape. From jail, Lily calls CeCe. CeCe calls her daughters irresponsible. Carol, who has come to pay Lily's bail, overhears Lily defend Carol's lifestyle. Carol takes the phone from Lily, informs CeCe that Lily will be moving in with her, and takes Lily back to the city.
question: Who is Keith van der Woodsen in Gossip Girl?
short_answers: rich, antagonistic director of Shep's music video
wikipage: Valley Girls

Long-form answers:
knowledge: content: "Valley Girls" is the twenty-fourth episode of the second season of The CW television series Gossip Girl.
wikipage: Valley Girls
long_answer: "Valley Girls" is the twenty-fourth episode of the second season of The CW television series Gossip Girl. Keith van der Woodsen plays Matt Barr, the rich, antagonistic director of Shep's music video. In the episode, Lily meets Owen Campos, who takes her to a club where they find Shep, Owen's musician friend, and Carol.