Why are there still umpires in Major League Baseball? Why can't it all be automated? - Quora
MLB umpires will have a new view this season -- on Zoom
Terrible umpiring was on full display on ESPN Sunday Night Baseball - Bleed Cubbie Blue
MLB umpires willing to let computers call balls and strikes: report
MLB umpire shares his opinion of new rules: Ken Rosenthal's conversation with Dan Bellino - The Athletic
Robot Umpires Could Be Coming to MLB as Soon as 2024 - CNET
What does an MLB home plate umpire wear for protection? - Quora
Roberto Ortiz becomes first MLB umpire from Puerto Rico
The Average Umpire Is Almost 50. The Best Ones Might Be in Their 30s. - WSJ
MLB umpires should be mic'd up to explain reviews and ejections - Bleed Cubbie Blue
Marlborough's Jim Reynolds calls it a career after 24 years as an MLB umpire - The Boston Globe
Earning Their Stripes as Umpires and Referees - The New York Times
MLB umpires may get on-field microphones to explain replay review outcomes - Bless You Boys
Umpire Jen Pawol is working her way to MLB - The Washington Post