He took this job because he thought it was impossible for a team to fire back - to - back coaches , a feat that has n't been done in 30 NFL seasons .
Kelly knew working for this franchise would be a challenge .
Kelly took this job because Kelly thought it was impossible for a team to fire back - to - back coaches , a feat that has n't been done in 30 NFL seasons .
Kelly knew working for this franchise would be a challenge .