Theismann accepted a college football scholarship to attend the University of Notre Dame, where he lived in Zahm Hall. He was a high school teammate of Drew Pearson. Theismann was raised in South River, New Jersey, and attended South River High School, where he lettered in baseball, basketball, and football. Theismann was born to Austrian Joseph John Theismann who 'ran a gas station and worked in his brother's liquor store.' His Hungarian mother, Olga Tóbiás, worked for Johnson & Johnson until her retirement. He also performs as a speaker for corporate events, speaking on topics such as leadership and self-motivation. Theismann is the owner of Theismann's Restaurant and Bar in Alexandria, Virginia, founded in 1975. Additionally, he works on the NFL Network on a variety of programs, primarily as an analyst. Since 2011, he has worked on the Washington Commanders preseason television broadcast team. Theismann also co-hosts the network's weekly show Playbook. Theismann also worked as a color analyst on NFL Network's Thursday Night Football package with play-by-play voice Bob Papa and Matt Millen. He primarily partnered with Mike Patrick, for the network's Sunday Night Football package and for one season of Monday Night Football with Mike Tirico and Tony Kornheiser.

Theismann worked as a sportscaster and an analyst on pro football broadcasts with ESPN for nearly 20 years. In the 1985 NFL season, he suffered an in-game catastrophic fracture to his right leg that would lead to his retirement from football. He played college football for the Notre Dame Fighting Irish and was inducted into the College Football Hall of Fame in 2003.

Theismann spent 12 seasons with the Washington Redskins, where he was a two-time Pro Bowler and helped the team to consecutive Super Bowl appearances, winning Super Bowl XVII over the Miami Dolphins and losing Super Bowl XVIII. He rose to fame playing quarterback in the National Football League (NFL) and Canadian Football League (CFL). Joseph Robert Theismann (born September 9, 1949) is an American former professional football player, sports commentator, corporate speaker and restaurateur.

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