Douglas Leon Eddings is an American professional umpire in Major League Baseball.
Jerry Blake Layne is an American umpire in Major League Baseball who has worked in the National League between 1989 and 1999, and throughout both major leagues since 2000. He wore uniform number 24 in the NL, but when MLB merged the AL and NL umpiring staffs in 2000, Layne was forced to switch to number 26, as AL umpire Al Clark, who also wore 24, had more seniority. When Clark was fired midway through the 2001 season by MLB, Layne reclaimed number 24 and has worn it ever since. With Joe West's retirement in 2022, Layne became MLB's most senior active umpire.
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 former 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.
Timothy Joseph Tschida is an American former umpire in Major League Baseball. He joined the American League's full-time staff in 1986, and worked in both major leagues from 2000 until his retirement following the 2012 season.
Edward Stephen Rapuano Jr. is an umpire supervisor in Major League Baseball who previously worked as an on-field umpire in the National League from 1990 to 1999 and throughout both major leagues from 2000 to 2012.
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 retired Major League Baseball umpire. He worked in the American League from 1990 to 1999 and in Major League Baseball from 2005 until his retirement in 2023. Hickox wore uniform number 39 with the American League and number 15 with Major League Baseball. He 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 American 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.
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.
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 two All-Star Games, two World Series, three League Championship Series, five 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 (born July 11, 1969) 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.
