The
Commissioner of Baseball is the chief executive of
Major League Baseball (MLB) and the associated
Minor League Baseball (MiLB) – a constellation of leagues and clubs known as
organized baseball. 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. 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.