Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Keith Leonard Kartz (born May 5, 1963 in Las Vegas, Nevada) was a center and tackle in the National Football League for the Denver Broncos. He started in Super Bowl XXIV. Kartz attended the University of California, Berkeley He graduated from San Dieguito High School located in Encinitas, California. American football is a sport played between two teams of eleven with the objective of scoring points by advancing the ball into the opposing team's end zone. Known in the United States simply as football, it may also be referred to informally as gridiron football.