 From 1975 to 1979 he was chairman of The International Commission on Dynamical Meteorology established in its current form by the International Association of Meteorology and Atmospheric Physics (IAMAP) (now the International Association of Meteorology and Atmospheric Sciences, IAMAS) at its plenary session in Zurich, Switzerland in 1967.Wiin-Nielsen also served as President of the European Geophysical Society (EGS, now the European Geosciences Union) from 1990 to 1992 and as director of the Danish Meteorological Institute.Wiin-Nielsen has published more than one hundred peer-reviewed papers in various scientific journals.