Mr Usher, of Chain Hills, said he had been a board member for nine years and was happy with his contribution but it was getting "harder and harder'' to find the time for the role.
The other commitments included owning Z service stations, performing as a magician, and working with the J.R.McKenzie Trust, Chatbus Trust and Relay For Life.
"When you are elected you are duty-bound to make sure you are making the contribution the role deserves and I'm finding it more and more difficult to find that time,'' Mr Usher said.
A highlight of his three terms was being part of a board which was "one of the most effective'' in Dunedin.
"We work very well together and we don't always agree but we don't let that get in the way of what we are there for.''
He encouraged people to stand for election and "make a difference in their community''.
"It's a good chance for someone new to come on and bring some new ideas, thoughts and vision to the board,'' he said.
He is particularly proud of two board achievements - the "great'' community plan and the emergency plan.
Board chairman Scott Weatherall said Mr Usher was an "awesome'' board member because of his involvement in business and other community organisations.
"He and Moyler [community board member and Supervalue Green Island owner John Moyle] are busy as but we are better off having them.''
Mr Usher was a "positive contributor'' to the board but his reasons for standing down were understandable, Mr Weatherall said.
"He's a top bloke and he's been a stalwart for the past nine years.''
Mr Weatherall expected Mr Usher would be "shoulder-tapping some other positive people'' to put their names forward for election.
Mr Weatherall said he would be standing for re-election and hoped the new board would retain him as chairman.
