1999-2023 MLB Umpire Rosters, Post Season and All Star Game Crews
A Large Number of Veteran MLB Umpires Are Retiring - Bleacher Nation
What do MLB umpires do in the off-season? - Quora
Sources - 10 MLB umps retiring, most since '99 - ESPN
MLB facing shocking & concerning umpire situation
10 MLB Umpires Retire - Baseball Says Bye to 261 Years of On-Field Major League Umpiring Experience
MLB Rumors: Ted Barrett & Greg Gibson Among 10 Umpires Retiring
still left standing
2023 Super Bowl: Patrick Mahomes and Chiefs rally to beat Eagles - Los Angeles Times
MLB: Umpire Tim Timmons falls down hard before Braves-Nats game
Gibson makes final call: MLB umpire retires after 24-year career, Sports
Infield Fly Rule: 2016
MLB umpire retirements, promotions