He then spent two years working as a Postgraduate Researcher for the University of California, Los Angeles (UCLA) and the University of Southern California (USC), at the Southern California Particle Center and Supersite, a Research Center of the U.S Environmental Protection Agency. Kuhn then worked as a Post-Doctoral Fellow in the Waterloo Center for Atmospheric Science of the University of Waterloo in Canada, before becoming an Assistant Professor at Luleå University of Technology in 2009. Since July of 2013 he is an Associate Professor in the Department of Computer Science, Electrical and Space Engineering within the Division of Space Technology in Kiruna. His areas of expertise include cloud physics and chemistry, ice particle properties, ice crystal growth, aerosol measurements and instruments. Among other projects, Kuhn is currently involved in ground based snowfall and ice fog measurements, and in-situ measurements of ice cloud properties.