After two seasons in which he compiled an 11–8–1 record, Biles was offered a defensive assistant's role with the
University of Notre Dame under head coach
Ara Parseghian, who had been at the helm during Biles career at Miami. However, Biles turned the offer down on January 4, 1964, citing his desire to remain as a head coach. He remained at the school for another five seasons, having his best success with the 1965 unit that finished 8–2, and compiled an overall record of 39–28–3. On January 27, 1969, Biles resigned his position at Xavier to become an assistant coach with the NFL's
New Orleans Saints. Working for two seasons under head coach
Tom Fears, Biles lost his job soon after Fears was dismissed in November 1970, but found work as a scout for the
New York Jets the following year. After one season in that capacity, Biles was selected as the Jets' defensive backs coach on June 24, 1972. He spent the next two seasons under the leadership of head coach
Weeb Ewbank, but when he retired following the
1973 NFL season, Biles again lost his job.
Houston Oilers With his Miami University pedigree, he was able to obtain a coaching position in 1974 with the Oilers under former Miami coach
Sid Gillman. When Gillman retired at the end of that season, he promoted
Bum Phillips to head coach, with Biles becoming the team's defensive coordinator. Over the next six seasons, the team showed constant improvement, reaching the
AFC Championship Game in both 1978 and 1979.
Head coach In 1980, the Houston Oilers reached the playoffs, but three days after an embarrassing loss to the Oakland Raiders in the 1980 AFC wild card game, Phillips was fired by Oilers owner
Bud Adams. On January 2, 1981, Biles was tabbed as the team's head coach. Biles inherited an aging football team and was unable to maintain the winning ways, falling to 7–9 in
1981 before dropping to 1–8 in the strike-shortened
1982 NFL season. When the team lost its first six games the next year, a string that extended a losing streak to 13 games, Biles resigned on October 10, 1983, and was replaced by defensive coordinator
Chuck Studley. Biles' frustration was evident at his final press conference when he said, "I've been a punching bag. I've been in the eye of the hurricane for two and a half years, the center of all controversies. I've felt like I've had enough." ==Later career==