<P> Joseph Priestley FRS (/ ˈpriːstli /; 24 March (O.S. 13 March) 1733--6 February 1804) was an 18th - century English theologian, English Dissenters clergyman, natural philosopher, chemist, innovative grammarian, multi-subject educator, and liberal political theorist who published over 150 works . </P> <P> He has historically been credited with the discovery of oxygen, having isolated it in its gaseous state, although Carl Wilhelm Scheele and Antoine Lavoisier also have strong claims to the discovery . </P> <P> During his lifetime, Priestley's considerable scientific reputation rested on his invention of soda water, his writings on electricity, and his discovery of several "airs" (gases), the most famous being what Priestley dubbed "dephlogisticated air" (oxygen). However, Priestley's determination to defend phlogiston theory and to reject what would become the chemical revolution eventually left him isolated within the scientific community . </P> <P> Priestley's science was integral to his theology, and he consistently tried to fuse Enlightenment rationalism with Christian theism . In his metaphysical texts, Priestley attempted to combine theism, materialism, and determinism, a project that has been called "audacious and original". He believed that a proper understanding of the natural world would promote human progress and eventually bring about the Christian Millennium . Priestley, who strongly believed in the free and open exchange of ideas, advocated toleration and equal rights for religious Dissenters, which also led him to help found Unitarianism in England . The controversial nature of Priestley's publications, combined with his outspoken support of the French Revolution, aroused public and governmental suspicion; he was eventually forced to flee in 1791, first to London and then to the United States, after a mob burned down his Birmingham home and church . He spent his last ten years in Northumberland County, Pennsylvania . </P>

Who discovered that air is made up of several gases