[1] Longo began his coaching career at Parsippany Hills High School in New Jersey, taking over a team that accumulated a .217 winning percentage over the previous 33 years.
At the time of his departure, Longo left as the winningest coach in school history while leading them to their first appearance in the New Jersey state playoffs and an undefeated championship season.
As head coach of La Salle, he compiled a 7–14 record over two years before leaving to accept the offensive coordinator position at Minnesota–Duluth.
[6] On December 15, 2016, it was reported that Longo was hired to be the new offensive coordinator and quarterbacks coach at the University of Mississippi.
On December 7, 2022, it was reported that Longo would be joining Luke Fickell's staff at Wisconsin as the offensive coordinator and QBs coach.