Joanna Stephens
![[[David Hartley (philosopher)|David Hartley]]’s review of Joanna Stephens’s Medicines](https://upload.wikimedia.org/wikipedia/commons/2/25/Frontispiece_of_David_Hartley%E2%80%99s_review_of_Joanna_Stephens%E2%80%99s_Medicines_%281739%29.png)
Joanna Stephens or Mrs. Stephens (? – 6 August 1774) was a British inventor of a medicine for bladder stones. After proving its efficacy she was paid £5,000 for revealing the recipe by the UK parliament. Her remedy was used and analysed in England and in France. Investigations inspired by her work may have been a basis for development of modern biochemistry.
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