Daniel Lee Dierdorf is a former American football player and current television sportscaster. He played 13 NFL seasons and has worked for ABC’s ‘Monday Night Football’ and CBS as a color commentator since his retirement. In 1987, he was added to the ‘Monday Night Football’ team, and was named as ABC’s blow-by-blow boxing commentator in 1989.
The 2006 season marked Dierdorf’s first season with Gumbel on CBS after working in 1999 with Verne Lundquist and from 2000-2005 with Dick Enberg. He is one of the investors of KTRS radio in St. Louis.
Source- Wikipedia http://en.wikipedia.org/wiki/Dan_Dierdorf