He spent 2006 as an assistant coach at Delcastle Technical High School in New Castle County, Delaware.
Hired ahead of the 2014 season, he helped build the upstart NAIA football program from the ground up as the offensive coordinator.
In his first season on staff, he helped lead the Bulldogs to the fourth straight play-off appearance and an 11-2 record.
[7] On February 5, 2024, Casula was hired back at the University of Michigan, this time by Sherrone Moore as the tight ends coach.
[8] On December 3, Kirk Campbell was fired by Michigan as offensive coordinator and Casula replaced him as the interim OC for the ReliaQuest Bowl win over Alabama.
[9] Chip Lindsey assumed the offensive coordinator duties following the bowl, and Casula resumed his sole role as the tight ends coach.