Jeff Nelson (umpire)

45 – Jeff Nelson
Nelson in 2011.
Born	(1965-06-01) June 1, 1965 (age 51) St. Paul, Minnesota
MLB debut	May 9, 1997
Umpiring crew
13
Crew members
Jeff Nelson (crew chief) Laz Díaz Doug Eddings Cory Blaser
Career highlights and awards
Special Assignments All-Star Games (2006, 2014) Wild Card Games (2012, 2015, 2016) Division Series (2000, 2001, 2005, 2008, 2009, 2014) League Championship Series (2002, 2004, 2010, 2011, 2012, 2015, 2016) World Series (2005, 2009, 2014)

Jeffrey Brian Nelson (born on June 1, 1965) is an umpire in Major League Baseball who was named to the National League staff prior to the 1999 season, and has worked throughout both major leagues since 2000. Nelson, a graduate of Bethel University in St. Paul, Minnesota, wears uniform number 45. He was promoted to crew chief starting for the 2014 season.

Nelson was named Top Prospect at the Joe Brinkman Umpiring School in 1989. He was promoted to the National League prior to the 1999 season along with Paul Nauert to fill vacancies left by the retirements of Jim Quick and Harry Wendelstedt.

While in the minor leagues, Nelson was the chief rules instructor at the former Brinkman-Froemming umpire school in Cocoa, Florida from 1997 until the school's closing in 1998. He continues to teach at umpire clinics in the off-season. Additionally, Nelson is currently the secretary/treasurer of the major league umpires' union, the World Umpires Association.

During his career, Nelson has received several postseason assignments, including the 2005 World Series, 2009 World Series and the 2014 World Series. He also worked the League Championship Series in 2002, 2004, 2010, 2011, 2012, 2015, and 2016; and the Division Series in 2000, 2001, 2005, 2008, 2009, and 2014. He has also umpired in the 2006 and 2014 MLB All-Star Games.