The Scot left the Stadium of Light a year ago today, following a 2-0 defeat at the hands of Lincoln City, just over a year after taking the reigns.
Here, we take a look back at the signings made under his watch and evaluate whether they were a success or not:
9. Charlie Wyke
A regular under Phil Parkinson, the striker still divides opinion among the fanbase. This season is a big one for him. VERDICT: THE JURY IS OUT Photo: FRANK REID 2019
10. Luke O'Nien
A fine performer on the pitch, and a great ambassador for the club off it, O'Nien has become a vital part of Sunderland's squad. VERDICT: HIT Photo: FRANK REID 2019
11. Max Power
Now captain of the side and has been a near ever-present since his arrival. VERDICT: HIT Photo: Frank Reid
12. Grant Leadbitter
Is starting to make a major impact on the field, and Leadbitter's presence behind the scenes has been invaluable. VERDICT: HIT Photo: Frank Reid