Ulf Sonntag Ulf Sonntag is head of market research and associate director at NIT, Institute for Tourism Research in Northern Europe, Kiel, Germany. He studied geography, political science and business administration at the University of Bonn, with international semesters in the USA and Switzerland. The general focus of Ulf’s work is understanding the dynamics of tourism on different spatial levels (regional, national, international) based on statistical analyses and quantitative and qualitative market research as well as the application and discussion of findings in planning and marketing. Among other things, Ulf is project manager of the German Reiseanalyse and in this position provider and advisor concerning tourism demand data for European destinations and tour operators. Since 2016, Ulf is also lecturer about “Quantitative Approaches in Tourism” at the Institut de Recherche et d’Études Supérieures du Tourisme (IREST), Université Paris 1 Panthéon-Sorbonne.