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Robert was March 22, 1868 in , Morrison, IL

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Professor Millikan has been President of the American Physical Society, Vice-President of the American Association for the Advancement of Science, and was the American member of the Committee on Intellectual Cooperation of the League of Nations, and the American representative at the International Congress of Physics, known as the Solvay Congress, at Brussels in 1921.

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During World War I, Millikan was Vice-Chairman of the National Research Council, playing a major part in developing anti-submarine and meteorological devices.

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He graduated from Oberlin College in 1891 and got a his doctorate at Colombia University in 1895.

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In 1896 he became an assistant at the University of Chicago where he became a full professor in 1910

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In 1916 he took up with similar skill the experimental verification of the equation introduced by Albert Einstein in 1905 to describe the photoelectric effect.

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“The Nobel Prize in Physics 1923.” NobelPrize.org, www.nobelprize.org/prizes/physics/1923/millikan/biographical/.

“Matter Rays.” Encyclopædia Britannica, Encyclopædia Britannica, Inc., 2019, www.britannica.com/science/radiation/Matter-rays.

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Millikan was an enthusiastic tennis player, and golf was one of his recreations.

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Millikan died on December 19, 1953, San Marino, CA

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In 1909 Millikan did a series of experiments to determine  the electric charge of carried by a single electron. The results suggested that the charge on the droplets is a multiple of the elementary electric charge, but the experiment was not accurate enough to be convincing.   He obtained more precise results in 1910 with his famous oil drop in which he replaced .

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Millikan proved that this radiation is indeed of extraterrestrial origin, and he named it "cosmic rays."

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Throughout his life Millikan remained a prolific author, making numerous contributions to scientific journals.

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1921 until his retirement in 1945, Millikan helped to turn the school (Caltech) into one of the leading research institutions in the United States.

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In 1921 Millikan left the University of Chicago to become director of the Norman Bridge Laboratory of Physics at the California Institute of Technology (Caltech) in Pasadena.

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Millikan was honored with the noble peace price for physicist in 1923 for his study of the elementary electronic charge and the photoelectric effect.