The former Linfield boss led the Sky Blues to three Irish Cup finals and three BetMcLean Cup deciders – including a 2-0 triumph over Carrick Rangers in the 2016/17 finale – and helped them secure European football on two occasions.
A titan of the local game, Jeffrey finished his Ballymena reign with a win percentage of 47%, coming out on the right side in 163 of his 346 games at the Showgrounds.
Here are all the best photos from his Ballymena reign, from cup victories to European adventures.
1. Jeffrey lifts the Irish League Cup
David Jeffrey proudly lifts the Irish League Cup trophy after Ballymena United defeated Carrick Rangers 2-0 Photo: Jonathan Porter/PressEye.com
2. Captain and coach
David Jeffrey celebrates with Ballymena United captain Jim Ervin after their Irish League Cup success Photo: Jonathan Porter/PressEye.com
3. Cup joy
David Jeffrey celebrates winning his first trophy since joining Ballymena with the fans Photo: Presseye/Stephen Hamilton
4. Thumbs up
David Jeffrey salutes the Ballymena United crowd following their Irish League Cup success Photo: Stephen Hamilton