Original: Joseph Priestley ( 13 March 1733 ( Old Style ) -- 6 February 1804 ) was an 18th-century English theologian , Dissenting clergyman , natural philosopher , educator , and political theorist who published over 150 works .
Simplified: Joseph Priestley ( March 13 , 1733 -- February 8 , 1804 ) was an English chemist , philosopher , clergyman , and teacher .