John Maurice Nelson
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After returning from studying with Wilhelm Ostwald in Germany, John M. Nelson received his Ph.D. under Marston T. Bogert. He, along with a Columbia University colleague K. George Falk, applied the electronic theory of valence to covalent bonds. They suggested that the direction the electron moves would depend on the relative position of the elements in the periodic table. This pioneering work offered an explanation for properties of organic compounds that had previously been a mystery.