After a two-year stint at Garden Grove High School, he resumed his collegiate coaching career at Colorado in 1969 and then served as the offensive coordinator at UNLV (1973–1975) and SMU (1976–1978).
Kennan joined the professional ranks in 1982 when Tom Flores named him quality control coach on his Los Angeles Raiders staff.
That year, he led the Monarchs to a 9–1 regular season record and captured the inaugural World Bowl title with a 21–0 victory over the Barcelona Dragons.
[4] After one season as Oakland's quarterbacks coach, Kennan was hired by Pete Carroll as offensive coordinator of the New England Patriots.
[6] On November 27, 2017, Kennan was dismissed as Incarnate Word's head football coach after finishing the 2017 campaign with a 1–10 record and a 1–7 mark in Southland Conference play.