|No. 55, 56|
September 8, 1952|
|NFL Draft:||1974 / Round: 1 / Pick: 8|
|Career NFL statistics|
High school and college
O'Neil was named a high school All-American while attending Warren Area High School in Warren, Pennsylvania. From 1970-1973, he played linebacker for coaching legend Joe Paterno at Penn State. A three-year letterman, he was team captain of the Nittany Lions' undefeated 1973 team and was named an All-American that same season.
He was the defensive coordinator for Hamilton Tiger-Cats of the Canadian Football League. He was hired March 2, 2007 to replace former coordinator Rod Rust, who now serves as a defensive consultant. Prior to coaching in the CFL, O'Neil spent three seasons as defensive coordinator for NFL Europe's Frankfurt Galaxy (2004-2006). He also coached for the Rhein Fire in 2002 and 2003.
It was as linebackers and special teams coach at Rutgers (1984-1994) that O'Neil first worked for future Frankfurt head coach Dick Curl. From 1996 to 1998, O'Neil was defensive coordinator for the University at Buffalo. He was also on the staff of Eastern Michigan University, followed by a year in Indiana University during 1983.
In 2012,O'Neil was the head coach of North Tonawanda High School's Junior Varsity team.
In 2013 was the assistant defensive coordinator of the North Tonawanda High School's Varsity Team. In 2014 he retired from coaching.
O'Neil lives in Pendleton, New York with his wife, Nancy. His eldest son, Kevin O'Neil, played linebacker at Syracuse University. Son Keith, played in the NFL for the Dallas Cowboys and Indianapolis Colts. His son-in law, Drew Haddad, was drafted by the Buffalo Bills in the seventh round of the 2000 NFL Draft. He played for the Indianapolis Colts and San Diego Chargers after setting several records for receiving at the University at Buffalo.