Major League Baseball

Rob Manfred became the tenth Commissioner of Baseball in January 2015. He has implemented significant rule changes including the pitch clock, shift restrictions, and larger bases to improve pace of play and increase action on the field.

Dan Halem serves as MLB's deputy commissioner, overseeing labor relations, legal affairs, and the league's relationship with the MLB Players Association.

Bud Selig oversaw baseball's recovery from the 1994 strike, introduced interleague play, the Wild Card, and expanded instant replay. He also navigated the steroid era and subsequent testing policies.

The first Commissioner of Baseball, appointed in the wake of the 1919 Black Sox scandal to restore the sport's integrity. His iron-fisted rule helped stabilize the game during a turbulent era.