The Pursuit of the Elusive Umpire Perfect Game - The Ringer
An appealing experiment at weekend Isotopes games: Players get to challenge ball-strike calls, Local News
As MLB moves toward using 'robot umpire,' getting strike/ball calls right is the goal
Major League Baseball teams now scouting umpires too
Robot umpires debut in independent Atlantic League
Umpire (baseball) - Wikipedia
Legendary umpire Joe West dishes on players, managers and replay at 5,000th game
MLB's Umpires. A problematic history, a modern dilemma. : r/mlb
Bickley: MLB needs automated strike zone