At the end of spring training in 1997, Long, who was assigned to the
Triple-A Omaha Royals, decided to retire, asking instead for a coaching job. He made his professional managing debut with the Class-A
Wilmington Blue Rocks. That year, he helped a young
Carlos Beltran learn how to switch hit. Long next served as the hitting coach for the
Wichita Wranglers in Double-A. It was there that he and manager Keith Bodie developed Long's popular net drill, an exercise used to help players shorten their swing. In 2001, he used the drill to turn
Brandon Berger into a 40-home run player. He then moved up to Triple-A as the hitting coach for the
Omaha Royals. When he didn't get an opportunity in 2004 to interview for the job of hitting coach for the big league team, he moved to the New York Yankees organization. Long was promoted to hitting coach for the New York Yankees in 2007. Long remained on the coaching staff after the Yankees hired
Joe Girardi as manager for the 2008 season. on their way to win the franchise's 27th
World Series title. Following the 2010 season, the Yankees signed Long to a three-year contract. He was fired following the 2014 season. On October 23, 2014, Long was hired by the
New York Mets to be their hitting coach. In his first season there, the
2015 Mets won the National League pennant. Long helped turn
Daniel Murphy into a power hitter; he hit seven homers in the 2015 postseason. He was a candidate for the open managerial position after the 2017 season, but was ultimately turned down in favor of
Mickey Callaway. Long left the Mets and became the hitting coach of the
Washington Nationals on November 2, 2017. The team then won the World Series in
2019. That year, the Nationals led the National League in batting average (.265) and on-base percentage (.342), and were in the top 10 in MLB in several other batting categories. On October 13, 2021, Long left the Nationals to become the hitting coach of the
Philadelphia Phillies, reuniting him with former Yankees manager
Joe Girardi. The Phillies reached the World Series in
2022. On November 12, 2022, the Phillies signed Long to a two–year contract extension. ==Personal life==