As manager of Harrogate Town Reed won promotion from the Evo-Stik Northern Premier First Division in 2002 and won the West Riding County Cup in successive seasons before taking on the manager role at Stalybridge Celtic.
After taking over part way through the 2005/06 season with Celtic eighteen points adrift, Reed oversaw a `great escape`. The following seasons Stalybridge missed out on the play-off places on the final day of the season.
Later, at Buxton, Reed lead his team to win the Derbyshire Senior Cup. During six seasons there he also missed out on promotion from the NPL Premier Division, losing to Gateshead in the play-off final.
Reed became assistant-manager at Scarborough before taking the reins at Ossett Town in 2014, replacing Craig Elliott, who left to join Shaw Lane.
Reed stayed on to assist Paul Quinn after Elliott departed for Boston United late last year.
Head of football operations Doug O'Connor told the club`s official website: "We're sorry to see Reedy go. He's had three fantastic years with us and we wish him all the best at Gainsborough Trinity in their bid to save themselves from relegation from the National League North."
On departing, Reed thanked everyone at Shaw Lane: "It's been a tremendous three years at the club. There are so many nice people - too many to mention.
"Last year winning the league and the county cup was special as it's something I've only ever done three times.
"I go to partures new but wish all the very best to everybody at Shaw Lane".