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Rate My Professor Ralph Walter Graystone Wyckoff

The University of Arizona

Ratings & reviews

5.04/23/2026

Always kind, respectful, and approachable.

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About Ralph Walter Graystone

Ralph Walter Graystone Wyckoff was an American crystallographer and pioneer in X-ray diffraction and electron microscopy. Born on August 9, 1897, in Geneva, New York, he received a Bachelor of Science degree from Hobart College in 1916 and a Ph.D. from Cornell University in 1919, with a thesis on the crystal structures of sodium nitrate and cesium dichloroiodate under Shoji Nishikawa. His early career at the Geophysical Laboratory of the Carnegie Institution from 1919 to 1927 advanced X-ray crystallography through studies of minerals and the development of Wyckoff positions, general and special coordinates permitted by crystal symmetry, which informed the International Tables for X-ray Crystallography. From 1927 to 1937 at the Rockefeller Institute for Medical Research, he extended X-ray methods to biological molecules, determining the structure of urea, and constructed an X-ray spectrometer with an ionization counter.