I am a German aerospace engineer in Berlin working since 40 years for the German Aerospace Center and consider myself an expert in fluid dynamics, aerodynamics, turbulence, acoustics, aeroacoustics, turbo-machinery and acoustic beamforming using phased arrays of microphones. I give lectures on aeroacoustics at the Brandenburg Technical University of Cottbus, Brandenburg, Germany.

In Wikipedia, I try to correct errors, whenever I run over them or make articles scientifically more correct.