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.
13. Second County Antrim Shield final
David Jeffrey's second County Antrim Shield final as Ballymena United manager ended with a sickening 2-1 defeat to Cliftonville with the Reds scoring in the 96th and 97th minutes to dash Sky Blue dreams. Photo: Colm Lenaghan/Pacemaker Press
14. Irish Cup final defeat
David Jeffrey applauds the Ballymena United fans after their 2-1 extra-time Irish Cup final defeat to Glentoran at Windsor Park Photo: Jonathan Porter Press Eye
15. Second Irish Cup final for Jeffrey at Ballymena
David Jeffrey led Ballymena United back into the Irish Cup final in 2021/22, where they suffered a devastating 2-1 extra-time defeat to Crusaders, who scored in the dying minutes of both normal and extra time. Jeffrey is pictured with captain Leroy Millar and Ross Redman at a press event ahead of the final at Windsor Park. Photo: Stephen Hamilton/Presseye
16. Ballymena progress to a third Irish Cup final in four seasons
What a photo! David Jeffrey celebrates after Ballymena United defeat Larne 2-0 in the 2022/23 Irish Cup semi-final at Seaview to set up a third Irish Cup final in four seasons for the Sky Blues Photo: Andrew McCarroll - Pacemaker Press