Robert John Valentine (born May 13, 1950 in Stamford, Connecticut) is a former player and manager in Major League Baseball whose playing career lasted from 1969-1979 with the Los Angeles Dodgers, California Angels, San Diego Padres, New York Mets, and Seattle Mariners. Valentine then served as manager of the Texas Rangers (1985-1992) and the Mets (1996-2002), leading the Mets to the 2000 National League pennant.
Valentine is currently serving as manager of the Japanese League Chiba Lotte Marines (2003-).
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