In 1949, McNamee was part of a syndicate, nicknamed the
Happy Hundred, that purchased the Philadelphia Eagles from
Alexis "Lex" Thompson for $250,000. In 1953, he succeeded majority shareholder
James P. Clark as team president. McNamee also served as secretary of Clark's
Liberty Bell Park Racetrack until Pennsylvania passed a law prohibiting public officials from operating horse tracks. In 1958, the Eagles moved from
Connie Mack Stadium to
Franklin Field after McNamee reached a deal with the
University of Pennsylvania. The Eagles were allowed to play at the stadium rent free, but made donations toward the maintenance of the field and allowed Penn to keep revenue from parking and concessions. The Eagles played the
1960 NFL Championship Game at Franklin Field and defeated the
Green Bay Packers 17–13. In 1960, McNamee was one of four owners who blocked
Marshall Leahy's appointment as
Commissioner of the National Football League due to his desire to remain in
San Francisco and move the league office to the west coast. After an eight-day deadlock, Leahy's supporters finally gave in and
Los Angeles Rams general manager
Pete Rozelle was elected as a compromise candidate. McNamee disagreed with Rozelle's decision to have the league play its normal schedule of games following the
assassination of John F. Kennedy. McNamee refused to attend the game in favor of a memorial service at nearby
Independence Hall, stating that "the game is being played by order of the commissioner". In December 1963, the "Happy Hundred" sold the club to
Jerry Wolman for $5,505,000. ==United Artists==