Walker played college football at UCLA and won the 1976 Rose Bowl with them.

He moved to the Redskins in 1980 and contributed to the team winning Super Bowl XVII.

He hosts a weekly television show called "Doc Walker's ProView," which airs Sunday mornings on ESPN 980 and Tuesday evenings at 11pm on MASN.

In 2011, he moved into the color analyst’s seat for radio broadcasts of Washington Football Team games on ESPN 980 after previously serving as the sideline reporter.

Previously he had been a co-host on The John Thompson Show and The Locker room with Doc Walker and Kevin Sheehan.