Dan O'Brien Sr.

For his son, see Dan O'Brien (baseball executive). For other people, see Dan O'Brien (disambiguation).
Dan O'Brien Sr.
O'Brien during his time with the Seattle Mariners, 1979–1983
Born(1929-03-26)March 26, 1929
Elizabeth, New Jersey, U.S.
DiedJanuary 16, 2017(2017-01-16) (aged 87)
Dallas, Texas, U.S.
Alma materSeton Hall University,
Florida Southern College
OccupationBaseball executive
Years active1955–1993
Children3, including Dan O'Brien Jr.

Daniel Francis O'Brien Sr. (March 26, 1929 – January 16, 2017) was an American professional baseball executive who served as the general manager of the Texas Rangers, Seattle Mariners and California Angels of Major League Baseball (MLB).