John Snow (scientist)

John Snow was a 19th-century English physician and a founding figure in the field of epidemiology. He is best known for his groundbreaking work during the 1854 cholera outbreak in London, where he mapped cases of the disease and linked them to a contaminated public water pump. His findings challenged the prevailing belief that diseases were caused by "bad air." By advocating for cleaner water and better sanitation, Snow laid the groundwork for modern public health practices. His methods and insights into disease transmission have had a lasting impact on how we understand and combat infectious diseases today.