John Snow is often called the founder of epidemiology, the study of health in populations. He is best known for his work on tracking the spread of cholera during an epidemic in London in 1854.

who was the first to find evidence that cholera spreads through tainted water. John Snow started mapping incidences of the disease in Soho, and noticed clusters around the Broad Street water pump.

In 1848, there was a second outbreak of cholera in London. Dr John Snow, a physician and specialist ... however by this time the epidemic had passed its peak. Despite having statistical evidence ...