MLB umpires on planes with teams? How could that possibly go wrong? - Federal Baseball
How well do umpires call balls and strikes? - Beyond the Box Score
Does MLB Have an Umpire Problem Sports Analytics Group at Berkeley
Umpires Are Less Blind Than They Used To Be
Joe West retires: MLB's record-setting umpire done after 45 years
How MLB Umpires Learned to Explain Replays to Crowds - The New York Times
The Average Umpire Is Almost 50. The Best Ones Might Be in Their 30s. - WSJ
MLB Fans Threaten to Boycott Over 'Robot Umpires'—'Will Ruin the Game
MLB hires first full-time umpire from Puerto Rico
Major League Baseball umpire selection process
They Call 'Em Like They See 'Em - Twinkie Town
MLB umpire Eric Cooper dies at 52; did playoffs 2 weeks ago
Minor League Umpires To Receive Significant Pay Raise In 2022 — College Baseball, MLB Draft, Prospects - Baseball America
Managers, Umpires, and Executives Get Their Hall of Fame Shot Via 2024 Contemporary Baseball Ballot