The Average Umpire Is Almost 50. The Best Ones Might Be in Their
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MLB Umpires Missed 34,294 Pitch Calls in 2018. Time for Robo-umps?, BU Today
Cardinals' Alec Burleson laments eighth-inning at-bat altered by umpire's calls
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The next job at risk of being marginalized by robots: Major League Baseball's umpires
The Average Umpire Is Almost 50. The Best Ones Might Be in Their 30s. - WSJ
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MLB will see 10 rookie umps replace veterans as position faces more changes, challenges than ever - The Athletic
BenFred: MLB umpires, you're out. It's time for an automated strike zone.