Arthur Jeffrey Dempster
| Arthur Jeffrey Dempster | |
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| Born | August 14, 1886 Toronto, Ontario, Canada |
| Died | March 11, 1950 (aged 63) Stuart, Florida, United States |
| Nationality | Canadian-American |
| Fields | Physics |
| Alma mater | B.S. University of Toronto M.S. University of Toronto Ph.D. University of Chicago |
| Known for | Developed the first modern mass spectrometer, discovered 235U (used in atomic bombs) |
| Notable awards | Newcomb Cleveland Prize (1929) |
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 Michael A. Grayson, Discovery of Isotopes of Elements (Part I: Arthur Jeffrey Dempster), Profiles in Chemistry, Chemical Heritage Foundation
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Arthur Jeffrey Dempster (August 14, 1886 – March 11, 1950) was a Canadian-American physicist best known for his work in mass spectrometry and his discovery of the uranium isotope 235U.
Dempster was born in Toronto, Ontario, Canada. He received his bachelor's and master's degrees at the University of Toronto in 1909 and 1910, respectively. He travelled to study in Germany, and then left at the outset of World War I for the United States; there he received his Ph.D. in physics at the University of Chicago.
Dempster joined the physics faculty at the University of Chicago in 1916 and remained there until his death in 1950.
During World War II he worked on the secret Manhattan Project to develop the world's first nuclear weapons.
From 1943 to 1946, Dempster was chief physicist of the University of Chicago's Metallurgical Laboratory or "Met Lab" which integrally related to the Manhattan Project and founded to study the materials necessary for the manufacture of atomic bombs.
In 1946, he took a position as a division director at the Argonne National Laboratory.
Dempster died on March 11, 1950 in Stuart, Florida at the age of 63.
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