Under Cook Spireites bagged the League Two title in 2013/14 before play-off semi-final disappointment followed in League One the season after with defeat at Preston.
He joined Chesterfield after success with Accrington on 25th October 2012 following the departure of John Sheridan.
The end of his first season saw Cook guide Chesterfield to eighth position, finishing just two points outside the play-off zone before two successful seasons followed.
The in-demand manager eventually left for Portsmouth in May 2015, where he won the League Two title once again the following season.
Here we look at just some of the memories from his first spell at Chesterfield.
The end of his first season saw Cook guide Chesterfield to eighth position, finishing just two points outside the play-off zone before two successful seasons followed.