MLB umpire Eric Cooper dies at 52; did playoffs 2 weeks ago
New Wireless Audio Lets MLB Umpires Make All the Calls Very Loud and Clear
Umpire (baseball) - Wikipedia
Report: MLB Umpire Crew Chiefs to Wear PA Microphones in 2022
Will Expanded Instant Replay Lead To More Women Umpires?
Joe West Breaks Record for Games Umpired - The New York Times
World Series ump crew youngest in years, nod to K-zone tech
MLB umpire tests positive for virus, crews shift
World Series umpire crew not much older than Justin Verlander