American sportscaster John Madden was the first to use which device to analyze the football plays?

John Earl Madden (April 10, 1936 - December 28, 2021) was an American football player, then coach and toward the end of his career, a sportscaster.

He played for the Philadelphia Eagles in 1958 and wore jersey number 77 as an offseason and/or practice squad member, playing the position of offensive tackle. After coaching at the collegiate level, he was hired as the head coach of the Oakland Raiders of the National Football League for ten seasons (1969-1978) and led them to a championship in Super Bowl XI in 1977. His overall career NFL statistics record for wins-losses-ties was 103-32-7. When the playoff games are included his record was 112-39-7.

After retiring from coaching, he worked as a color commentator for NFL telecasts until 2009, for which he won 16 Sports Emmy Awards. He worked for all four major networks: CBS (1979-1993), Fox (1994-2001), ABC (2002-2005), and NBC (2006-2008). He retired from broadcasting after the 2008 football season ended in 2009.

He displayed a lively and flamboyant delivery as an announcing style and used the telestrator, a device which allowed him to superimpose his light-penned diagrams of football plays over video footage. This technique was popularized and is now a staple of TV coverage of all sports.

In 2006, Madden was inducted into the Pro Football Hall of Fame in recognition of his coaching career.

Madden was also the author of several books and served as a commercial pitchman for various products and retailers.