Richard Hirschfeld Williams was an American left fielder, third baseman, manager, coach and front-office consultant in Major League Baseball. Known especially as a hard-driving, sharp-tongued manager from 1967 to 1969 and from 1971 to 1988, he led teams to three American League pennants, one National League pennant, and two World Series triumphs. He is one of nine managers to win pennants in both major leagues, and joined Bill McKechnie in becoming only the second manager to lead three franchises to the Series. He and Lou Piniella are the only managers in history to lead four teams to seasons of 90 or more wins. Williams was inducted into the National Baseball Hall of Fame in 2008 following his election by the Veterans Committee.

The history of the Athletics Major League Baseball franchise spans the period from 1901 to the present day, having begun as a charter member franchise in the new American League in Philadelphia before moving to Kansas City in 1955 for 13 seasons and then to the San Francisco Bay in Oakland, California, in 1968. The team endured numerous attendance issues stemming from the aging Oakland Coliseum before the MLB owners approved the team's application to relocate to Las Vegas, Nevada in 2023. With four locations, the A's have had the most homes of any MLB team.