Frederick Christopher "Chris" Klein (born March 14, 1979) is an American movie actor. He is best known for playing Chris "Oz" Ostreicher in three of the American Pie films, and starring opposite Mel Gibson in the Vietnam War movie We Were Soldiers.
Klein was born and raised in Hinsdale, Illinois. His mother, Terese (née Bergen), is a kindergarten teacher, and his father, Fred Klein, is an engineer. Klein was the second of three children. His older sister Debbie was born in 1978, and his younger brother was born in 1982. 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. He attended Texas Christian University (TCU) in Fort Worth, Texas.