Dr. John T. Snow

Dr. John T. Snow was a pioneering physician and public health advocate in the 19th century, best known for his work during the 1854 cholera outbreak in London. He used mapping techniques to trace the disease's source to a contaminated public water pump on Broad Street. His findings demonstrated the critical link between water quality and health, leading to improvements in sanitation and urban planning. Snow is often regarded as one of the founding figures of modern epidemiology, emphasizing the importance of data and observation in understanding and controlling diseases. His work laid the foundation for public health practices today.