With graduate students he has researched and published on wetland hydrology and carbon exchanges for more than 20 years. He also works within a team of researchers who are focussed on mitigating emissions of greenhouse gases from intensively managed farmland, including the drained peatlands (www.waiber.com). Dave works with other wetland scientists at Landcare Research, the Department of Conservation and Canadian Universities, and is also passionate about wetland education. He represented the National Wetland Trust on the Collaborative Stakeholder Group, which worked to develop the Healthy Rivers Wai Ora Regional Plan Change..