Callahan was fired as Tennessee Titans head coach midway through the 2025 season with the team at 1-5. In one-plus seasons as Tennessee head coach, Callahan went 4-19.
Callahan was quarterbacks coach for the Detroit Lions in 2016 and 2017, then held that position for the Oakland Raiders in 2018. He was a non-play calling offensive coordinator for the Cincinnati Bengals from 2019-2023 before becoming Tennessee head coach.
Callahan worked with Peyton Manning as a young assistant coach with the Denver Broncos, Matthew Stafford with the Lions, Derek Carr with the Raiders, and Joe Burrow with the Bengals.
This sets up a weird dynamic where Callahan, the former Tennessee head coach is in a key role on the Giants’ staff and former Giants’ head coach Brian Daboll is now offensive coordinator for the Titans.
The Giants have surrounded second-year quarterback Jaxson Dart with experienced coaches in offensive coordinator Matt Nagy, senior offensive assistant Greg Roman, and now Callahan.