Campbell, William Wallace (1862-1938), an American astronomer, was director of the Lick Observatory in California from 1901 to 1923. He became known for his work in spectroscopy, the examination and analysis of spectra of light. He also made important measurements of the motion of stars. During a solar eclipse in 1922, he observed the deflection of starlight by the sun’s gravitational field. This observation, first made by Arthur Eddington, supported Albert Einstein’s theory of general relativity. Campbell was born on April 16, 1862, in Hancock County, Ohio. He died on June 14, 1938.
