Following Neil Harris' departure from Millwall, LJ is now the longest serving Manager in the Championship 1. Lee Johnson (Bristol City) - 3 years, 239 days Following in the footsteps of one of the Robins most successful managers in Steve Cotterill, signing Johnson from Barnsley was something of a gamble for the Lansdown family. There have been bumps in the road along the way, and pressure on the board to end the project, but patience has been rewarded with the club achieving season-on-season growth under the 38-year-old. For me it's all about stability. I think we have progressed each season under his stewardship. I agree with their statement about bumps in the road - this forum was very split a couple of years ago. Others in the top 5 are Warnock (Cardiff), Mowbray (Blackburn), Cook (Wigan) & Neill (Preston)