Mr Leen is the Managing Director of John Leen Plumbing Limited and JLP Commercial Limited.  The companies are Wellington based contracting businesses concentrating on major commercial projects.

Mr Leen is a Certifying Plumber and Drainlayer with over 30 years’ experience as a business owner in the industry.

Mr Leen has undertaken a number of governance roles on commercial and advisory boards including across the plumbing industry including executive member and past President of the Wellington Master Plumbers Association, a director and chair of Master Plumbers Gasfitters & Drainlayers NZ Inc., Masterlink Ltd and NZ Plumbers Journal Ltd.  He has also been a member of advisory boards for the Plumbers Gasfitters & Drainlayers Board, the Skills Organisation and local polytechnics.

Mr Leen is a member of the Institute of Directors in New Zealand (Inc.).