Final answer:
Werner Heisenberg spent most of his career in Germany and Switzerland, becoming a leading physicist in early quantum mechanics and heading Germany's nuclear bomb project during World War II.
Step-by-step explanation:
The question seeks to identify which scientist among the provided options spent most of their career in Germany and Switzerland. From the information given, we can determine that Werner Heisenberg is the scientist being referred to. Heisenberg was one of the foremost physicists who developed early quantum mechanics and received the Nobel Prize in 1932. Notably, Werner Heisenberg remained in Germany during World War II, leading the German effort to build a nuclear bomb. This period of his career and the geographic locations mentioned align with his residency in Germany and Switzerland.