Bernie's joy in international travel and quest to conquer the uncertainties in the theoretical basis of weather modification from microphysics to thermodynamics, cloud dynamics, and targeting of seeding material led to international workshops like the German Test and Research Institute for Aviation and Space Flight (DFVLR
, now known as DLR) Irsee Cloud Physics and Numerical Modeling Workshop in 1985.
After 14 years in aerospace research with DFVLR
Oberpfaffenhofen in the field of optimal trajectories, in 1975, he became full professor of control engineering in the Aerospace Department at the University of the Bundeswehr near Munich.
Following completion of a program-definition phase, a consortium of Germany's DFVLR
flight-test center, the DLR research agency, electronics contractor ESG (Munich, Germany), and the German arm of the European Aeronautic, Defence and Space company (Munich, Germany) are moving towards flight demonstration of unmanned-aerial-vehicle (UAV) operation in controlled airspace under instrument-flight rules (IFR).