He was a lawyer by training, held political office in several administrations, and was the founder of the American Hellenic Institute.

[2] He was a star football player at Erasmus Hall High School, as was his mentor Sid Luckman.

He is most remembered for sealing Columbia's 21–20 victory over Army in October 1947 that snapped the Cadet's 32-game unbeaten streak.

[9] He and teammate Leo Kusserow became widely known as the "Goal Dust Twins" and the Columbia quarterback team [10][11] In 1949, Rossides was drafted by the New York Giants during the 10th round.

[15] In the wake of the Turkish invasion of Cyprus, Rossides founded the American Hellenic Institute in 1974 and his lobbying contributed to the US arms embargo against Turkey took effect on February 5, 1975, and remained in place until 1978.