Joern holds a license as an urban planner and has broad expertise in the fields of vulnerability, sustainable development and environmental assessment. He is specialized in the development of assessment methodologies and indicators to estimate and evaluate different socio-economic trends and environmental degradation at sub-national, local and household levels.
He is currently the IPCC lead author in the IPCC Special Report “Managing the Risk of Extreme Events and Disasters to Advance Climate Change Adaptation.” He is also the lead author of the Fifth Assessment Report of the IPCC in the chapter “Emergent Risks and Key-Vulnerabilities.” His work experience also encompasses research activities and lectures in such areas as London and Mexico. In addition to research and training activities at UNU-EHS, Joern also teaches at the Institute for Geography at the University of Bonn. He is currently involved in vulnerability assessment in coastal and flood-prone communities in Indonesia and Vietnam and also coordinates the development and testing of indicators to measure vulnerability to floods, heatwaves and droughts, as well as sea level rise in Germany, Egypt and Indonesia.