John Hasbrouck van Vleck
John Hasbrouck Van Vleck (March 13, 1899 – October 27, 1980) was an American physicist, co-awarded the 1977 Nobel Prize in Physics, for his contributions to the understanding of electrons in magnetic solids.
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- ... one can still say that quantum mechanics is the key to understanding magnetism. When one enters the first room with this key there are unexpected rooms beyond, but it is always the master key that unlocks each door.
- Quantum Mechanics, The Key to Understanding Magnetism, Nobel Lecture  (December 8, 1977)