Christopher Klein (born March 14, 1979) is an American actor who is best known for playing Chris 'Oz' Ostreicher in the American Pie comedy teen films, and more recently, the serial killer Cicada on The Flash. Klein was raised in Brookfield, Illinois. As a child, Klein had his first on stage experience by singing This Little Light of Mine in a community theater at the Sheraton Convention Center in Chicago. He lived in the town for thirteen years before his family moved to Omaha, Nebraska. At Millard West High School in Omaha, Klein acted in his high school's performance of West Side Story, played cornerback and linebacker for the football team, and swam on the Millard West Swim Team. In his senior year, Klein was offered his first professional acting job by director Alexander Payne, who was scouting Omaha, his hometown, as a potential filming location for the film Election. Soon after, Klein found a steady amount of work in the film industry while briefly attending TCU, where he studied theater and was a member of the Lambda Chi Alpha fraternity. He was next seen in American Pie, acting as Christopher Russell Ostreicher, which opened on July 9, 1999, and was a box office success. The following year Klein starred in Here on Earthalongside Lee Lee Sobieski and Josh Hartnett (2000). Klein reprised his role in American Pie 2 (2001) and American Reunion (2012). In 2002, Klein had a role in the Mel Gibson Vietnam War film We Were Soldiers. Klein has also appeared in several teen movies, including Just Friends (2005) and American Dreamz (2006).

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