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Minor League Baseball Umpire Development, formerly known as Professional Baseball Umpire Corp (PBUC), a Minor League Baseball wholly owned subsidiary, first entered into a working agreement to provide its reserve umpires to the Coastal Plain League beginning in 2008. The agreement allows reserve list umpires to continue to develop their skills in a competitive environment, while waiting for the call from MiLB Umpire Development to work Minor League Baseball games. 

"Minor League Baseball is extremely excited about our partnership with the Coastal Plain League," said Minor League Umpire Development Director Dusty Dellinger. "We could not have a better environment for our future professional umpires to train and gain such valuable experience. Our relationship with the Coastal Plain League has been extremely valuable to our organization in the sense that we can have our next available professional umpires working in an environment in the CPL that is very comparable to what they will face in pro ball. The experience the CPL provides our umpires can’t be matched and we hope that our relationship continues for years to come."

Since 2008, 157 PBUC reserve umpires have gotten their start in the Coastal Plain League, with an impressive 106 of them moving on since to work games in Minor League Baseball. Furthermore, Nic Lentz became the first former CPL umpire to make it to the Major Leagues on April 20, 2016. Lentz served as the first base umpire during the Washington Nationals and Miami Marlins game along side home plate umpire Hunter Wendelstedt, second base Umpire Scott Barry, and third base umpire Tripp Gibson.

“We have enjoyed working with Dusty, Larry [Reveal] and the staff at Minor League Baseball Umpire Development, as well as the numerous reserve umpires that have come through the Coastal Plain League during our lengthy partnership,” said CPL COO/Commissioner Justin Sellers. “We feel that our quality of play and overall atmosphere has gone a long way in helping the development of future Minor and Major League Baseball umpires. The number of alumni that have gone on from the CPL into umpiring in professional baseball is strong proof that our relationship has been beneficial to both parties.” 

In addition to Larry Reveal serving as the League's Umpire Supervisor, the League also employees five other umpire evaluators; all of whom have a vast background in the collegiate and professional ranks.  The evaluators use their experience to observe and later coach each CPL umpire crew following every evaluation as part of their seasonal develpment.

MiLB Umpire Development is responsible for the training, evaluation and recommendation for promotion, retention or release of all umpires in the Minor League Baseball system throughout the United States and Canada.

Below are the 2018 Coastal Plain League Umpires: