Florence Nightingale, Data Scientist.
In 1858 Florence Nightingale published her now famous “rose diagram” breaking down causes of mortality.
By w:Florence Nightingale (1820–1910). – http://www.royal.gov.uk/output/Page3943.asp [dead link], Public Domain, Link
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Data Scientist and trainer at Win Vector LLC. One of the authors of Practical Data Science with R.