Admitted to the New York bar in 1963, he commenced practice in Buffalo, and served as assistant district attorney of Erie County, New York in 1964. Erie County Comptroller from 1966 to 1974, he was also a delegate to the New York State Democratic convention in 1970, and to the
Democratic National Convention in 1972 and 1988.
Congress Nowak was elected as a Democrat in 1974 – among a group of liberal Democrats elected that year known as the
Watergate Babies — to represent
New York's 37th congressional district in the
94th Congress, after 4 terms Nowak was redistricted into the
33rd district, which he represented for 5 terms. He served from January 3, 1975, to January 3, 1993, choosing not to try and return to the House after the 33rd district was abolished during redistricting. During his entire congressional career, he was a member of the
U.S. House Committee on Public Works and Transportation. He was described in
The Buffalo News as "Buffalo's billion-dollar man", a self-effacing lawmaker mainly known for securing grants for infrastructure projects in the Buffalo area, including the construction of
Interstate 990. During the
103rd Congress, Nowak chose not to run for reelection in 1994. With many new members anticipated in 1995 because of heavy turnover, Nowak reportedly did not want to remain in Congress so long his successor started a House career with a seniority disadvantage, though his decision to retire prompted disappointment among Democratic leaders in both Buffalo and
Albany, the state capital. ==Personal life and death==