Ms Lawson said in a statement today she reached a point where she wanted to pursue a future career which was more aligned with her previous experience in the United Kingdom, particularly around private-public partnership.
"When I started this job it was with a clear objective to deliver greater accountability, transparency and value for money,'' she said.
"I wanted to ensure this council's plans were affordable in the long term.''
As the council this week continued consultation around its 10-year plan, Ms Lawson said she was pleased to report performance had improved significantly in all areas.
"I have thoroughly enjoyed the challenges of the role over the last two-and a half years and I feel proud to be a part of an amazing community,'' she said.
Ms Lawson said she felt good about the decision and had no immediate plans other than to enjoy the winter season in Queenstown.
