[1] He joined the NFL as a part-time employee in high school,[2] and attended Iona College on a tennis scholarship.
In July 1971, Hadhazy became administrative assistant to Upton Bell, general manager of the New England Patriots.
[3] The Browns hired him as executive vice president before the start of the 1976 season and added the title of general manager in 1977.
[5] After the USFL folded, Hadhazy returned to the NFL, where he served in numerous capacities.
He served as a general manager [6] of the Ohio Glory in the World League from 1991–92,[7] as the labor operations director for the league's Management Council [8] and, at the time of his death, the NFL's director of game operations.