Prof. Mathias W. Rotach holds a PhD in Environmental Physics from The Swiss Federal Institute of Technology (ETHZ) with a specialization in Atmospheric Physics. He is a full Professor in Dynamic Meteorology at the University of Innsbruck, Austria. His research group in Innsbruck is specialized in boundary layer dynamics and exchange processes over complex terrain, such as mountainous and urban surfaces. He has (co-)authored around 130 peer-reviewed papers on various aspects in boundary layer meteorology. Prof. Albert (Bert) A.M. Holtslag holds a PhD in Boundary Layer Meteorology from Wageningen University in the Netherlands. He is Emeritus Professor of Meteorology and former Chair at the Meteorology and Air Quality Section at Wageningen University (1999-2019). With his research group he worked on many aspects of atmospheric boundary layers over land, including air quality dispersion, urban weather and climate and land-atmosphere interactions. He has (co-)authored around 180 peer-reviewed papers on various aspects in boundary layer meteorology.