William Webster Hansen (27.05.1909-23.05.1949) was an American physicist and a member of the National Academy of Sciences (1949). He was born in Fresno. He graduated from Stanford University (1929), where he worked from 1934 (as professor from 1942).
His research was in the field of accelerator technology, electronics and nuclear magnetic resonance. He invented the klystron (1938). He built a linear electron accelerator based on klystrons. With F. Bloch he discovered (1946) nuclear magnetic resonance.