Born into a Quaker family, in Cumberland England, this man went on to create his own atomic theory. It supported the fact that elements are composed of small particles, atoms. These atoms cannot be created nor destroyed. Though this theory was later found to be not entirely accurate, it did help further the research of other chemists. He based his theory off of the law of constant composition, and the law of conservation of mass. John was colorblind, as was his brother, he researched the topic a lot, so much so that it is sometimes referred to as 'Daltonism'.