If you aren't a white male, YER OUT of luck as an umpire - Global Sport Matters
MLB, Official Information, Umpires
Umpire (baseball) - Wikipedia
MLB announces World Series umpires - True Blue LA
FTX Strikes Sponsorship Deal With MLB, Umpires to Wear Crypto Exchange's Logo - CoinDesk
MLB umpires will wear mics to explain review rulings to fans starting this season
MLB, Official Information, Umpires
Looking Official: The Umpire Uniform - Little League
MLB umpire reportedly tests positive for COVID-19 - Sports Illustrated
Some 10 umpires reportedly to opt out of shortened MLB season - The Boston Globe
AP sources: MLB replay could vanish, monastery setup viable
MLB, Official Information, Umpires