William Henry Dinneen, alternately spelled Dineen, was an American right-handed pitcher in Major League Baseball who followed his 12-year career from 1898 to 1909 with a highly regarded tenure as an American League umpire from 1909 to 1937.
Bill Dinneen
Umpires for the World Series of 1924 lined up before the game with George Phillips, left, official announcer. Left to Right: Phillips, Umpires Bill Dinneen, Bill Klem, Ernest C. Quigley, and Tom Connolly.
In baseball, the umpire is the person charged with officiating the game, including beginning and ending the game, enforcing the rules of the game and the grounds, making judgment calls on plays, and handling the disciplinary actions. The term is often shortened to the colloquial form ump. They are also sometimes addressed as blue at lower levels due to the common color of the uniform worn by umpires. In professional baseball, the term blue is seldom used by players or managers, who instead call the umpire by name. Although games were often officiated by a sole umpire in the formative years of the sport, since the turn of the 20th century, officiating has been commonly divided among several umpires, who form the umpiring crew. The position is analogous to that of a referee in many other sports.
An MLB umpiring crew meeting with the managers from each team before a 2017 game
Home plate umpire Malachi Moore reviews the lineup cards from both teams before a 2016 minor league baseball game
Base umpire Stu Scheurwater calls Eduardo Escobar safe.
An umpire calling a strike on Barry Bonds (#25)