Douglas Leon Eddings is an American professional umpire in Major League Baseball.
Timothy Reid McClelland is an American former umpire in Major League Baseball who worked in the American League from 1983 to 1999 and throughout both leagues from 2000 through the 2013 season. He called many important games, from post-season games to the George Brett "Pine Tar" game in 1983. He was the plate umpire for the Sammy Sosa corked bat game on June 3, 2003, when the Chicago Cubs hosted the Tampa Bay Devil Rays at Wrigley Field. He wore uniform number 36 after his promotion to the AL, and kept the number when Major League Baseball merged the American and National League umpiring staffs in 2000.
Martin Robert Foster is an American retired Major League Baseball umpire. After first working in the American League in 1996, he was added to the MLB umpiring staff in 2000. Foster retired following the 2022 season.
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.
Michael John Winters is an American former umpire in Major League Baseball who has worked in the National League from 1988 to 1999 and throughout both major leagues from 2000 to 2019, wearing number 33. For the 2011 season, Winters was named a crew chief following the retirements of Jerry Crawford, Mike Reilly, and Chuck Meriwether.
Alfonso Márquez is a Mexican umpire in Major League Baseball (MLB) who worked in the National League in 1999 and has worked throughout both major leagues since 2000. He was promoted to crew chief for the 2020 season, becoming the first full time Latino-born crew chief. Márquez wears uniform number 72, a number he shared with friend and National Hockey League linesman Stéphane Provost.
Philip Cuzzi is an American professional baseball umpire in Major League Baseball (MLB). He worked as a reserve umpire in the National League (NL) from 1991 to 1993 and returned to the NL in 1999. Since 2000, he has worked in both major leagues. Cuzzi wore number 99 when his career started; he now wears number 10.
Paul Warren Schrieber was an American professional baseball umpire, who worked in Major League Baseball from 1997 to 2015. His first game was on June 6, 1997. He wore uniform number 43. He umpired the MLB All-Star Game in 2000 and 2015 and the Division Series in 1999, 2000, 2001, and 2014.
William Scott Miller is an American Major League Baseball umpire who began his career in the American League in 1997. Miller wears number 26. He has been a crew chief since the 2014 season.
Edwin William Hickox is an American umpire in Major League Baseball who worked in the American League from 1990 to 1999 and throughout both major leagues beginning in 2005. He wears uniform number 15. Hickox has officiated the Division Series in 2007, 2010, 2012, and 2019 and 2020, as well as the 2011 Major League Baseball All-Star Game.
Martin John Springstead was an umpire in Major League Baseball who worked in the American League from 1966 to 1985 and had since worked as an umpire supervisor. He was the youngest umpire ever to serve as crew chief in the World Series, heading the staff for the 1973 Series at the age of 36 years and 3 months.
William Anthony Welke is an American retired Major League Baseball umpire. He joined the major league staff in 1999 and worked the World Series in 2015. Welke was promoted to crew chief for the 2022 season, and retired following that season.
Eric Richard Cooper was an American professional baseball umpire, whose Major League Baseball (MLB) career spanned 1999 until his death in October 2019. He wore umpire uniform number 56. As a Major League umpire, Cooper officiated in ten Division Series, four League Championship Series, three Wild Card Games, one All-Star Game, and one World Series.
Andrew Jay Fletcher is an American umpire in Major League Baseball, wearing number 49. He worked in the National League in 1999 and has worked across both major leagues since 2000. Fletcher has appeared in one Major League Baseball All-Star Game and in one World Baseball Classic.
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.
James Patrick Hoye is an American umpire in Major League Baseball. He wears number 92. Hoye worked as an MLB reserve umpire from 2003 to 2009 for both the American and National Leagues. He was hired to the full-time Major League staff prior to the 2010 season. Hoye has worked one All-Star Game (2015), two World Series, three League Championship Series, four Division Series, and five Wild Card Games/Series. He was promoted to crew chief in 2023.
Christopher Gene Guccione is an American umpire in Major League Baseball. He wears number 68.
Mark Christopher Carlson is an American umpire in Major League Baseball. He wore number 48 until the 2012 season, when his number changed to 6. He was promoted to crew chief for the 2021 season.
Victor Joseph Carapazza is an American Major League Baseball umpire. He wears uniform number 19, and previously wore uniform number 85.
William John Hohn is an American former professional baseball umpire. He worked in Major League Baseball during 1987–1999 and 2002–2010. His uniform number was 29.
