Art of being an MLB umpire: ESPN's Sport Science Baseball
Robot umpire: Baseball edges closer to implementing automatic strike zone in major leagues : r/baseball
How Much Do MLB Umpires Make? - EssentiallySports
Slate - What They Teach You at Umpire School
Major League Baseball expands 'robot umpire' use throughout all 30 Triple-A ballparks
LONG JOURNEY from MINORS to MLB WORLD SERIES
Solving the Umpire Shortage in Youth Sports Requires a Team Approach — HiCast Sports
2020 MLB rules changes signal future of baseball - ESPN
Major League Baseball umpire selection process
MLB Umpires Missed 34,294 Pitch Calls in 2018. Time for Robo-umps?, BU Today
The making of a major league umpire, Sports
It's past time for MLB to address its umpiring problem - Battery Power
Longtime MLB umpire reflects on career
Joe West (umpire) - Wikipedia