1862 – William Wallace Campbell was born on the 11th of April in Hancock County, Ohio. Amercian astronomer known particularly for his spectrographic determinations of the radial velocities of stars.
1886 – He graduated from the University of Michigan with a B.S. in engineering, but the reading of Newcomb’s Popular Astronomy and work as a student assistant in the university observatory under John M. Schaeberle had turned him toward astronomy as a career.
1888 – He returned to the University of Michigan as instructor in astronomy to succeed Schaeberle, who had gone to the newly-opened Lick Observatory.
1890 – Campbell studied astrophysics with James E. Keeler at the Lick Observatory.
1892 – Married to Elizabeth Ballard Thompson.
1900 – He was director of Lick Observatory.
1901 – Campbell was then appointed director upon the unanimous recommendation of 12 of the leading astronomers of the world.
1902 – The honorary degree of LL.D. was awarded to him by the University of Michigan.
1906 – Awarded the Henry Draper Medal.
– Received the Gold Medal of the Royal Astronomical Society.
1909 – He was appointed Silliman Lecturer at Yale.
1915 – He was awarded with the Bruce Medal.
1923 – Served as President of the University of California.
1924 – He discovered many spectroscopic binary stars, and he published a catalog listing more than 1,000 of them.
1930 – Campbell retired from the Presidency and the directorship of Lick Observatory upon reaching the age of 68.
1931-1935 – Became the president of National Academy of Sciences.
– He was elected president of the National Academy of Sciences and steered it skillfully through four financially critical years.
1938 – He committed suicide and died on 14th of June in San Francisco, California.
– He catalogue the radial velocities of stars.
– Campbell crater on the Moon named after him.