Aksel Wiin-Nielsen describes his research in weather forecasting methods at the Royal Swedish Air Weather Service; his work on numerical weather prediction at the Joint Numerical Weather Prediction Unit in the United States; his appointment to the National Center for Atmospheric Research (NCAR) and research in dynamic meteorology; his recollections of NCAR and its staff, 1961-1963; his assignment to create a department of meteorology at the University of Michigan; his involvement with the formation of the European Centre for Medium Range Weather Forecasts; and his responsibilities as Secretary General, World Meteorological Organization and Director, Danish Meteorological Institute. He recounts his interactions and collaborations with Philip D. Thompson and Joseph Smagorinsky.