Ralph Walter Graystone Wyckoff

Ralph Walter Graystone Wyckoff (1897–1978) was an influential American physicist, primarily known for his work in the field of crystallography. He is often credited with developing the Wyckoff positions, which are a key concept in the study of crystal structures. These positions describe the different ways in which atoms can be positioned in a crystal lattice and help to categorize the symmetries of crystal structures.