Background
After playing football at Upper St. Clair High School in Pittsburgh, Pennsylvania, Ferentz played linebacker for the University of Connecticut. He was a football captain and an academic all-Yankee Conference linebacker at Connecticut. He served as a student assistant at Connecticut in 1977 and graduated in 1978. Ferentz spent his next two seasons as defensive coordinator at Worcester Academy, where he taught English literature. He then spent one season in 1980 as an assistant offensive line coach at the University of Pittsburgh. That Panther team, coached by Jackie Sherrill, finished with an 11–1 record and a number two national ranking.
Ferentz was the offensive line coach at the University of Iowa under Hall of Fame coach Hayden Fry for nine seasons, from 1981 to 1989. Eleven Hawkeyes coached by Ferentz went on to play in the NFL. Three of them were first round picks in the NFL draft, and five of his players were first team All-Big Ten selections.
Ferentz left Iowa to coach at the University of Maine in 1990. After three seasons of coaching the Black Bears to a combined 12–21 record, he was named the offensive line coach of the NFL's Cleveland Browns. Ferentz served under Bill Belichick in Cleveland and followed the franchise to Baltimore when they became the Baltimore Ravens.