Joseph Priestley
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"Joseph Priestley" was an 18th-century English theologian, English Dissenters/Dissenting clergyman, Natural philosophy/natural philosopher, chemistry/chemist, educator, and Liberalism/Liberal Political philosophy/political theorist who published over 150 works. He is usually credited with the discovery of oxygen, having isolated it in its gaseous state, although Carl Wilhelm Scheele and Antoine Lavoisier also have a claim to the discovery.

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.

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