<P> Another pioneer, Thomas Sydenham (1624--1689), was the first to distinguish the fevers of Londoners in the later 1600s . His theories on cures of fevers met with much resistance from traditional physicians at the time . He was not able to find the initial cause of the smallpox fever he researched and treated . </P> <P> John Graunt, a haberdasher and amateur statistician, published Natural and Political Observations...upon the Bills of Mortality in 1662 . In it, he analysed the mortality rolls in London before the Great Plague, presented one of the first life tables, and reported time trends for many diseases, new and old . He provided statistical evidence for many theories on disease, and also refuted some widespread ideas on them . </P> <P> John Snow is famous for his investigations into the causes of the 19th century cholera epidemics, and is also known as the father of (modern) epidemiology . He began with noticing the significantly higher death rates in two areas supplied by Southwark Company . His identification of the Broad Street pump as the cause of the Soho epidemic is considered the classic example of epidemiology . Snow used chlorine in an attempt to clean the water and removed the handle; this ended the outbreak . This has been perceived as a major event in the history of public health and regarded as the founding event of the science of epidemiology, having helped shape public health policies around the world . However, Snow's research and preventive measures to avoid further outbreaks were not fully accepted or put into practice until after his death . </P> <P> Other pioneers include Danish physician Peter Anton Schleisner, who in 1849 related his work on the prevention of the epidemic of neonatal tetanus on the Vestmanna Islands in Iceland . Another important pioneer was Hungarian physician Ignaz Semmelweis, who in 1847 brought down infant mortality at a Vienna hospital by instituting a disinfection procedure . His findings were published in 1850, but his work was ill - received by his colleagues, who discontinued the procedure . Disinfection did not become widely practiced until British surgeon Joseph Lister' discovered' antiseptics in 1865 in light of the work of Louis Pasteur . </P>

Who is known as the father of epidemiology