Major League Baseball umpire loses appeal of discrimination lawsuit
MLB asking umpires for more checks of pitchers for sticky substances
What do MLB umpires do in the off-season? - Quora
MLB Umpires Missed 34,294 Ball-Strike Calls in 2018. Bring on Robo-umps?, Bostonia
MLB's Umpires. A problematic history, a modern dilemma. : r/mlb
Gibson makes final call: MLB umpire retires after 24-year career, Sports
Hazards of the Job: Umpire Injury, Told by Those Who Witnessed It
MLB Umpire Salary Revealed - How Much Do Baseball Umpires Make?
MLB umpire job responsibilities
Heads Up - Umpire's Role Relative to Baseball's Unwritten Rules
Major League Baseball umpires: Danger zone ahead?
Baseball Umpires
Robot Umpires Could Be Coming to MLB as Soon as 2024 - CNET