Umpire Placement Course
Instant replay on table for NFL owners - The Boston Globe
Officiating crews for the 2022 season – Football Zebras
Veteran umpire Tim Welke is retiring - NBC Sports
UPDATE: MLB determines the Tigers did not hit umpire Quinn Wolcott
David Rackley - Wikipedia
Dale, we know you're gay.' How a Major League Baseball umpire came
NFL to make history with first all-black officiating team as Los
Ángel Hernández's lawsuit accusing MLB of racial discrimination