Stefan Brönnimann has studied Geography at the University of Bern and obtained his PhD in 2001 from that University. After a postdoc at the University of Arizona in Tucson, USA, he returned to Switzerland in 2004 where he started his own group as a Swiss National Science Foundation Professor at the Institute for Atmospheric and Climate Science of ETH Zurich, Switzerland. In 2010 he returned to the Institute of Geography of the University of Bern as a full professor. He is also a member of the Oeschger Centre for Climate Change Research of the University of Bern.
His research interests encompass large-scale climate weather variability, atmospheric circulation, and climate history. He uses historical instrumental data, documentary data and climate models to reconstruct past weather and climate regionally and globally. His group has studied effects of El Niño and volcanic eruptions on climate and society and has studied the variability of the tropical circulation and monsoon systems in the past.