He attended Eastern Illinois University, where he also played for their football team.
On March 10, 2021, Kelly was retained as offensive coordinator under head coach David Culley.
[3] On January 13, 2022, Kelly was fired by the Texans, alongside head coach David Culley.
[4] On February 8, 2022, Kelly was hired by the Tennessee Titans as their passing game coordinator under head coach Mike Vrabel.
On February 6, 2024, Kelly was hired by the New York Giants as their tight ends coach under head coach Brian Daboll, replacing Andy Bischoff, who left to take the same position with the Los Angeles Chargers.