He played for the Cardinals, the Dallas Cowboys - where he was a three-time Pro-Bowler and a second team All-Pro - and the San Francisco 49ers, with whom he went to Super Bowl XLVII.

Davis received an athletic scholarship to attend the University of Texas at Austin, arriving in John Mackovic's final season, with the intention of playing at defensive tackle and even started three games at that position.

In 2004, after Dennis Green was named the new head coach, he was moved to left tackle where he would remain for three seasons, even though he struggled at the position and was one of the highest penalized players in the league.

On February 17, 2007, the Cardinals told Davis that they would not name him a franchise or transition player, clearing him to become an unrestricted free agent.

[5] At the time, the contract was criticized in the media, for the amount of salary cap space being assigned to a player who would play guard and who had an average performance in previous years.

According to Forbes, Davis was the highest-paid NFL player and 19th overall athlete in the 12-month period ending in June 2007, earning $25.4 million.

The Cowboys finished 13-3 and won the NFC East division, but suffered a disappointing first round playoff loss against the New York Giants (who would go on to win the Super Bowl).

[9] Davis is the bassist in the heavy metal band Free Reign with former Cowboys' teammates Marc Colombo and Cory Procter with guitarist Justin Chapman.