He was for both. AND the Cubs and I think the Mets.
He went head to head with the Chicago Machine over Wrigley Field lights.
Dallas Green didn’t manage the Cubs, but he was their GM from like 1982 to 1989, and he was instrumental in building those magical 1984 Cubs that broke the franchise’s 39-year drought without post-season play. Green acquired several former Phillies through trades or free agency, including Gary Matthews, Larry Bowa, Keith Moreland, Bobby Dernier, Richie Hebner, Dick Ruthven, Warren Brusstar, and a certain minor-league shortstop with just 9 major-league at bats by the name of Ryne Sandberg.
Philadelphia Phillies (1960-1964, 1967)
Washington Senators (1965)
New York Mets (1966)
As Manager
Philadelphia Phillies (1979 - 1981)
New York Yankees (1989)
New York Mets (1993 - 1996)
As General Manager
Chicago Cubs (1982 - 1987)
I found this on Wiki.