Dennis is a Director of the New Zealand based forest industry advisory, publishing and conference and industry tour organising company, DANA (NZ) Limited.

Dennis has had previous experience in almost all aspects of the forestry and forest products sector working for Fletcher Challenge, and regularly travels to overseas countries to update his information base on the industry. He has been a Director of a TIMO, a eucalyptus plantation- owning company, and a wood export company. Dennis has been the author/co-author of twelve editions of the New Zealand Forest Industry Sector Review. He has co-authored 28 annual editions of the International Woodchip Trade Review. From 1997 to 2016 Dennis co-authored five editions of the Global Tree Farm Economics Review.

Dennis has organised and co-organised conferences, field trips and industry tours in New Zealand, Australia, North, Central and South America, United Kingdom, China, South Africa and South East Asia.