Nielsen works in partnership with the Yukon mining industry and focuses his research on Mine Water Treatment, Mine Waste Management and Mine Revegetation. He works especially on passive treatment of mine impacted waters in cold climate: enhancement of metal removal from cold waters by biological-chemical processes.
Guillaume is an outdoor enthusiast and enjoys field work.
In the last few years, he also has become increasingly interested in expanding his tool set to include collaboration with industry, academic and First Nations in water management projects.