Dan O'Brien Sr.

For other people named Dan O'Brien, see Dan O'Brien (disambiguation).

Dan O'Brien Sr. is a former front office executive in Major League and minor league baseball. He is the father of Dan O'Brien Jr., a former MLB general manager and scouting director.


Dan Sr. came to the major leagues after nine years (1964–72) as assistant to Philip Piton and Hank Peters, presidents at the time of the National Association of Professional Baseball Leagues, the minor leagues' governing body. He joined the Texas Rangers as a vice president during the 1973 season, and was promoted to general manager of the Rangers later that season; he would continue in that post through 1978, although he shared power with co-general manager Eddie Robinson in 1977–78.

In 1979, O'Brien became president of the Seattle Mariners, then in their third year as an American League expansion team, and he added the general manager title to his duties from 1981–83, replacing Lou Gorman. He left Seattle in 1984 and joined the front office of the Cleveland Indians in 1986, working with Peters again as his top assistant in 1987–89.

O'Brien then moved to the California Angels as top aide to general manager Mike Port, and then succeeded Port as the team's GM from the close of the 1991 season through 1993. He was replaced by Whitey Herzog at the end of the '93 campaign.

Of O'Brien's three major league teams, only the Rangers of the late 1970s experienced sustained success, contending for, but never winning, the championship of the American League West Division. The Mariners climbed to the middle of the pack in the AL West in 1982, then fell into the basement, with 102 losses, in O'Brien's last year. In Anaheim, O'Brien inherited a .500 team, but the Angels lost 90 games in 1992 and 91 games more in 1993.


Preceded by
Joe Burke
Texas Rangers General Manager
Succeeded by
Eddie Robinson
Preceded by
Seattle Mariners President
Succeeded by
Chuck Armstrong
Preceded by
Lou Gorman
Seattle Mariners General Manager
Succeeded by
Hal Keller
Preceded by
Mike Port
California Angels General Manager
Succeeded by
Whitey Herzog
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