Tolong jelaskan mengenai Sejarah Manajer dari Linfield F.C.

Below is a list of the managers Linfield have appointed during the club's history. In the early years after the club was formed in 1886, the team was selected by the club committee, a standard practice by football clubs at the time. Since then, 25 different men have held the position of Linfield first team coach/manager. However, only six have been appointed since Billy Campbell's departure in 1975. David Jeffrey holds the record for the longest reign as manager, having been in charge for 17 years and 16 weeks between 4 January 1997 and 26 April 2014. Jeffrey and Roy Coyle jointly hold the record for the most trophies won as manager, having led the club to 31 major honours each. Former Northern Ireland international Warren Feeney is the club's previous manager, having been appointed in May 2014. He resigned in October 2015 to become assistant manager of Newport County, with current manager David Healy appointed as his successor.