The Commissioner of Baseball is the chief executive of Major League Baseball and the associated Minor League Baseball – a constellation of leagues and clubs known as organized baseball.
Minor League Baseball is a hierarchy of professional baseball leagues in the Americas that compete at levels below Major League Baseball and provide opportunities for player development and a way to prepare for the major leagues.
Major League Baseball is a professional baseball organization, the oldest of the four major professional sports leagues in the United States and Canada.
Minor leagues are professional sports leagues which are not regarded as the premier leagues in those sports.
Under the direction of the Commissioner, the Office of the Commissioner of Baseball hires and maintains the sport's umpiring crews, and negotiates marketing, labor, and television contracts.
Marketing is the study and management of exchange relationships.
The commissioner is chosen by a vote of the owners of the teams.
The current commissioner is Rob Manfred, who assumed office on January 25, 2015.
Robert D. "Rob" Manfred, Jr. is an American lawyer and business executive who is the tenth and current Commissioner of Baseball.