Jason Daniel Kendall is an American former professional baseball catcher. He played in Major League Baseball (MLB) from 1996 through 2010 for the Pittsburgh Pirates, Oakland Athletics, Chicago Cubs, Milwaukee Brewers, and Kansas City Royals. He is the son of former catcher Fred Kendall, who played in the majors from 1969–1980.
Lloyd Glenn McClendon is an American former professional baseball player, coach and manager. He played in Major League Baseball (MLB) as an outfielder from 1987 to 1994 for the Cincinnati Reds, Chicago Cubs, and the Pittsburgh Pirates.
Dale Curtis Sveum is an American former Major League Baseball (MLB) player and manager. He most recently served as the bench coach for the Kansas City Royals. As a player, Sveum saw action in 12 major league seasons between 1986 and 1999. He was a member of the Milwaukee Brewers, Philadelphia Phillies, Chicago White Sox, Oakland Athletics, Seattle Mariners, Pittsburgh Pirates, and New York Yankees. Following his playing career, Sveum managed in minor league baseball for several seasons before becoming an MLB coach. Sveum briefly served as manager of the Brewers in 2008 during his tenure as hitting coach for the team. He was later named manager of the Cubs after the 2011 season and served for two seasons. His cousin is former Blue Jays All-Star John Olerud.
Gary Richard Darling is a former umpire in Major League Baseball. After beginning his career in the National League from 1986 to 1999, he worked throughout both major leagues from 2002 until his retirement in 2014. He wore uniform number 37.
Jeffrey Brian Nelson is an American professional baseball umpire in Major League Baseball (MLB), who was named to the National League (NL) staff prior to the 1999 season, and has worked throughout both major leagues since 2000.
Ángel Hernández is a former Cuban-American umpire in Major League Baseball (MLB). He worked in the National League from 1991 to 1999, and has worked throughout MLB since 2000 until September 29, 2023.
James Michael Wolf is an American Major League Baseball umpire. He joined the major league staff in 1999 after working in the Arizona Rookie League, the South Atlantic League, the California League, the Texas League and the Pacific Coast League. He wears uniform number 28.
Lazaro Antonio Díaz Sr. is an American umpire in Major League Baseball wearing number 63, a reference to his year of birth. He joined the American League's full-time staff in 1999, and has worked throughout both major leagues since 2000. Díaz was promoted to crew chief for the 2022 season, becoming the second full time Latino crew chief, after Alfonso Marquez.
Major League Baseball (MLB) uses instant replay review to allow league officials to review certain types of plays in order to determine the accuracy of the initial call of the umpires on the field. Reviews may be initiated either by a team's manager with limitations or by the umpires themselves. All instant replay reviews are examined by umpires at the Replay Command Center in New York City, who have the final decision as to whether to uphold or overturn the initial call.
Todd Frederick Tichenor is an American professional baseball umpire. He became a Major League Baseball reserve umpire in 2007 and was promoted to the full-time MLB staff in 2012. He wore number 97 until the 2014 season, when he switched to number 13.
Samuel Woodford Holbrook is an American retired Major League Baseball umpire. He made his MLB debut in 1996 and was promoted to crew chief in 2017. Holbrook worked the World Series in 2010, 2016, and 2019. He retired following the 2022 season.
Victor Joseph Carapazza is an American Major League Baseball umpire. He wears uniform number 19, and previously wore uniform number 85.
Angel Hernandez Campos is an American former umpire in Major League Baseball (MLB). He umpired his first major league game on May 3, 2007. He was released after the 2014 season.
Lance Cole Barrett is an umpire in Major League Baseball (MLB). He wore number 94 but changed to 16 starting in the 2020 season. Barrett became a minor league umpire in 2003 and was hired to the MLB staff prior to the 2014 season.
Michael William Muchlinski is an American Major League Baseball umpire. He umpired his first Major League game on April 24, 2006, and was officially hired by MLB prior to the 2014 season.
Alan Dwayne Porter Jr. is an American Major League Baseball umpire. He umpired his first Major League game on April 5, 2010. He wears uniform number 64.
Cory Steven Blaser is an American Major League Baseball umpire. He umpired his first major league game on April 24, 2010.
Manuel Augusto González is a Venezuelan umpire in Major League Baseball (MLB). He made his major-league umpiring debut on May 17, 2010, filling in for John Hirschbeck, becoming the first Venezuelan umpire in MLB history.
David Ross Rackley is an American Major League Baseball umpire. He made his Major League umpiring debut on August 13, 2010. He wears uniform number 86.
Christopher Patrick Conroy is an American Major League Baseball (MLB) umpire. He made his MLB debut on September 29, 2010. His uniform number is 98. Conroy was officially added to the full-time staff of MLB umpires on June 14, 2013, replacing Brian Runge. He was promoted to crew chief in 2023.
