John Dalton
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![Various atoms and molecules as depicted in John Dalton's A New System of Chemical Philosophy (1808).](/Images/godic/202501/07/A_New_System_of_Chemical_Philosophy_fp5440.jpg")
![Dalton in later life by Thomas Phillips, National Portrait Gallery, London (1835).](/Images/godic/202501/07/John_Dalton_by_Thomas_Phillips,_18355440.jpg")
John Dalton FRS (6 September 1766 – 27 July 1844) was an English chemist, physicist, and meteorologist. He is best known for his pioneering work in the development of modern atomic theory; and his research into colour blindness, sometimes referred to as Daltonism, in his honour.