SDSU alum becomes first black crew chief in MLB – The Daily Aztec
MLB cites two Red Sox games in response to Angel Hernandez legal filing
MLB Umpires Missed 34,294 Pitch Calls in 2018. Time for Robo-umps?, BU Today
Rung Up: Are Postseason Umpires Actually Baseball's Most Accurate?
Adrian Johnson, Alan Porter named crew chiefs
Robo umps reach Triple-A, but MLB rollout still uncertain
MLB umpires will have a new view this season — on Zoom - Hawaii Tribune-Herald
Forgotten milestone: MLB's first Black umpire took the field for Cleveland Indians game
Porter, Johnson become MLB's 2nd, 3rd Black ump crew chiefs - NBC Sports