MLB, Official Information, Umpires

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Roberto Ortiz becomes first MLB umpire from Puerto Rico

MLB Umpires Missed 34,294 Ball-Strike Calls in 2018. Bring on Robo-umps?, Bostonia

MLB umpire, Urbandale native Pat Hoberg selected to work World Series

MLB, Official Information, Umpires

MLB umpire job responsibilities

Umpire (baseball) - Wikipedia

MLB, Official Information, Umpires

Some 10 umpires reportedly to opt out of shortened MLB season - The Boston Globe

Umpire (baseball) - Wikipedia