Robotic Baseball Umpires

Two years ago, DeJesus became the first umpire in a regular-season game anywhere to use something called the Automated Ball-Strike System. Most players refer to it as the “robo-umpire.” Major League Baseball had designed the system and was testing it in the Atlantic League, where DeJesus works. The term “robo-umpire” conjures a little R2-D2 positioned behind the plate, beeping for strikes and booping for balls. But, for aesthetic and practical reasons, M.L.B. wanted human umpires to announce the calls, as if playacting their former roles. So DeJesus had his calls fed to him through an earpiece, connected to a modified missile-tracking system. The contraption looked like a large black pizza box with one glowing green eye; it was mounted above the press box. When the first pitch came in, a recorded voice told DeJesus it was a strike. He announced it, and no one in the ballpark said anything.

The New Yorker