Final answer:
Peter Behrens was the architect for the stadiums in Germany, including the AEG Turbine Factory.
Step-by-step explanation:
The architect for the stadiums in Germany is Peter Behrens. Behrens was an influential Bauhaus architect from Germany, known for his design of the AEG Turbine Factory in 1909. This building was revolutionary in its design features, with windows 100 meters long and 15 meters high.