Heath was appointed last year by Reid after they had been together at Sunderland.
Heath's contacts led to most of the loan signings, including Zoumana Camara, Didier Domi, Lamine Sakho, Salomon Olembe and Cyril Chapuis.
Don Warters, head of media relations since the departure of David Walker last season, has also left the club.
Warters' departure follows the arrival on the board of Peter Lorimer, who has taken on responsibility for media affairs.
Others who have left since the club was taken over include members of the security and office staff.
Heath's contacts led to most of the loan signings, including Zoumana Camara, Didier Domi, Lamine Sakho, Salomon Olembe and Cyril Chapuis.
Don Warters, head of media relations since the departure of David Walker last season, has also left the club.
Warters' departure follows the arrival on the board of Peter Lorimer, who has taken on responsibility for media affairs.
Others who have left since the club was taken over include members of the security and office staff.