Martinus Beijerinck, Dutch microbiologist and botanist (d. 1931)

Martinus Willem Beijerinck (Dutch pronunciation: [maɹˈtinʏs ˈʋɪləm ˈbɛiə̯rɪnk], 16 March 1851 – 1 January 1931) was a Dutch microbiologist and botanist who was one of the founders of virology and environmental microbiology. He is credited with the discovery of viruses, which he called Contagium vivum fluidum.