Studied landscape ecology and architecture at the Technical University of Munich-Weihenstephan, followed by a doctorate in vegetation ecology. Since 2003 head of the department of vegetation technology and planting design at the Technical University of Berlin. Member of national and international committees, advisory boards and foundations (such as ICB Muskau /Mużakowski and Branitz, Karl Foerster Foundation, Design Advisory Board Public Spaces Berlin). Main areas of work: Theory in planting design with special emphasis in perennial use, design of urban nature especially dealing with spontaneous vegetation, green space management, urban trees and green infrastructure (infiltration swales, evaporation beds), plants in historic parks and gardens, plants and climate change.

Kühn is a speaker on the webinar Trees in Climate Change in Historic Gardens on the topic «The influence of climate change on trees in historic parks. Current state and outlook under garden heritage aspects.»