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Joseph Priestley
JPriestley Portrait.jpg
Priestley by William Artaud
Born13 March 1733
Fieldhead, Yorkshire, England
Died8 February 1804
Northumberland, Pennsylvania

Joseph Priestley (13 March 1733 – 8 February 1804) was an English chemist, philosopher, clergyman, and teacher. He is known as the discoverer of oxygen. He was a Unitarian.

On 1 August 1774, Priestly identified oxygen in his laboratory at Bowood House in Wiltshire, England. view more...