Antonj van Leeuwenhoek (1632-1723)
A Dutch microscopist, studied the cellular structure of plants and animals,
including bacteria, protozoans, and sperms. He also first published an account
of such observations. He was probably the first to see bacteria (1676), and his
descriptions were quite good considering the low magnifications (300 diameters)
of the 247 microscopes that he constructed. Through his accurate accounts and
observations he discovered free-living and parasitic protozoans (1674-1703) and
is known as the father of protozoology.