Why do people credit John Snow with being the father of applied epidemiology?

"For his persistent efforts to determine how cholera was spread and for the statistical mapping methods he initiated, John Snow is widely considered to be the father of [modern] epidemiology." John Snow, born in 1813, was the son of a coal-yard laborer in York, England.

Explanation:

For his persistent efforts to determine how cholera was spread and for the statistical mapping methods he initiated, John Snow is widely considered to be the father of [modern] epidemiology." John Snow, born in 1813, was the son of a coal-yard laborer in York, England.

Explanation:

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