Haas was the owner of the
Oakland Athletics of
Major League Baseball, acquiring the team from
Charles O. Finley in August
1980 for less than $13 million (equivalent to $51.1 million in 2025) The acquisition was to prevent the team from moving, as Finley had wanted to sell to industrialist
Marvin Davis, who planned to move the team to
Denver. Under Haas' ownership, the Athletics won five
American League West Division titles (the first in
1981 and the last in
1992, advancing to three consecutive
World Series between
1988 and
1990, defeating the cross-bay rival
San Francisco Giants in
1989 in a sweep marred only by the infamous
Loma Prieta earthquake). Haas would accept the
Commissioner's Trophy on behalf of himself, the players, and
Tony LaRussa, who won his first world championship. On the date of his death, the organization memorialized Haas with a retirement of his "jersey" due to his services for the organization and the city of
Oakland. It remains placed with the jerseys of retired player numbers at the Athletics' current home field. ==Philanthropy==