Florence Nightingale

The Lady with the Lamp, English social reformer, statistician and the founder of modern nursing.

Florence Nightingale
Nightingale significantly reduced death rates by improving hygiene and living standards and creating data visualisation for the committee to understand the importance of hygiene.

Here's a time line of Florence Nightingale's life:

"She is a "ministering angel" without any exaggeration in these hospitals, and as her slender form glides quietly along each corridor, every poor fellow's face softens with gratitude at the sight of her. When all the medical officers have retired for the night and silence and darkness have settled down upon those miles of prostrate sick, she may be observed alone, with a little lamp in her hand, making her solitary rounds.."

-- Cited in Cook, E. T. The Life of Florence Nightingale. (1913) Vol 1, p 237.

God called me in the morning and asked me would I do good for him alone without reputation. Wikipedia entry.