How many NFL coaches were former players?

Of the 30 current NBA head coaches, a staggering 22 have previous NBA playing experience:

Mike Woodson, Atlanta Hawks

Doc Rivers, Boston Celtics

Vinnie Del Negro, Chicago Bulls

Rick Carlisle, Dallas Mavericks

George Karl, Denver Nuggets (NBA and ABA)

Michael Curry, Detroit Pistons

Don Nelson, Golden State Warriors

Rick Adelman, Houston Rockets

Mike Dunleavy Sr., Los Angeles Clippers

Phil Jackson, Los Angeles Lakers

Marc Iavaroni, Memphis Grizzlies

Scott Skiles, Milwaukee Bucks

Randy Wittman, Minnesota Timberwolves

Byron Scott, New Orleans Hornets

Mike D'Antoni, New York Knicks

Maurice Cheeks, Philadelphia 76ers

Terry Porter, Phoenix Suns

Nate McMillan, Portland Trail Blazers

Reggie Theus, Sacramento Kings

Sam Mitchell, Toronto Raptors

Jerry Sloan, Utah Jazz

Eddie Jordan, Washington Wizards

Additionally, Larry Brown of the Charlotte Bobcats never played in the NBA but did play in the ABA.