First-Base Umpires Call Them as They Hear Them - The New York Times

MLB Umpires Missed 34,294 Pitch Calls in 2018. Time for Robo-umps?, BU Today

Umpire Position With A Runner on First

Umpire Position With A Runner on First

From 'God' to gotcha: the long decline of Major League Baseball umpires, MLB

Look who's in the All-Star Game: Minnesota umpire Jeff Nelson – Twin Cities

The road is rough — but these wannabe Major League Baseball umpires are keeping their eyes on the ball

The road is rough — but these wannabe Major League Baseball umpires are keeping their eyes on the ball

Baseball one step closer to having its first female umpire - The Ashcroft-Cache Creek Journal

Making the Call: Your Decision to Umpire - Little League

How MLB Umpires Learned to Explain Replays to Crowds - The New York Times

MLB widening runner's lane to first, changing a rule that caused World Series controversy

American Professional Baseball Outfielder First Baseman Editorial

The MLB umpire who didn't always call them like he saw them - The Washington Post

MLB umpires need tech help at the plate, says researcher

Tips to Help a Base Umpire with Timing - Little League