Bacteria and microorganisms were first observed by Anton van Leeuwenhoek in 1676 using a single-lens microscope made by himself. He is known as the Father of Microbiology and thus is known as the first microbiologist. He described the first organisms he saw as animalcules.
the father of microbiology is Antonie Phillips van Leeuwenhoek FRS was a Dutch businessman and scientist in the garden Age of Dutch Science and technology.