He was director of Lick Observatory from 1900 to 1930. He specialized in spectroscopy.
Campbell was a pioneer of astronomical spectroscopy, he catalogued the radial velocities of stars, and was a director of Lick Observatory from 1901 to 1930. He served as 10th President of the University of California from 1923 to 1930. He committed suicide on June 14th, 1938 at the age of 76.
Honours and awards
* Henry Draper Medal (1906)
* Gold Medal of the Royal Astronomical Society (1906)
* Bruce Medal (1915)
* Campbell crater on the Moon
* Crater on Mars
* Asteroid 2751 Campbell
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