Created the Atomic Theory
John Dalton was an English Chemist who discovered the Atomic Theory. John Dalton was an English Chemist who, in his early career, identified red and green color blindness, which he was the first person to study color blindness and created Dalton's Law of Partial Pressure. He was born on September 6, 1766 in Eaglesfield, England. He died on July 26, 1844 in Manchester, England.