Nigel was appointed in January 2009,making him the 4th longest serving manager .He previously managed  Burton Albion ,taking them from the Southern League Premier division to the brink of promotion to League 2(they were 13 points clear at the top when he left)  He took over at Derby from Paul Jewel (who had replaced  Billy Bonehead)and was given the task of reducing the wage bill while improving results.Progress has been very slow but I think we are only just short of a promotion challenging side.The problem for Nigel at the moment is acquiring players who are better than the ones already at Derby while remaining within the tight budget imposed by our owners                                                             

Nigel was appointed in January 2009,making him the 4th longest serving manager .He previously managed  Burton Albion ,taking them from the Southern League Premier division to the brink of promotion to League 2(they were 13 points clear at the top when he left)  He took over at Derby from Paul Jewel (who had replaced  Billy Bonehead)and was given the task of reducing the wage bill while improving results.Progress has been very slow but I think we are only just short of a promotion challenging side.The problem for Nigel at the moment is acquiring players who are better than the ones already at Derby while remaining within the tight budget imposed by our owners                                                             

Who are the 3 managers above him? Wenger.... I can't name any more

Quite right,Joe-Arsene Wenger was appointed  by Arsenal in September,1996.The other 2 are-Paul Tisdale (Exeter) appointed 26/6/2006 and ex Alfreton Town manager Chris Wilder appointed by Oxford United,21/12/2008.

When trends are irreversible IMO. If there doesn't seem to be anything the current manager can do to buck the trend,he must be replaced.