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He is considered to be the microscope inventor. He observated almost everything that he had access to, such as conducts or blood vessels.

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He was the first the first one using the word "cell" in his book "Micrographia". He chose that word because when he was observating a piece of cork through the microscope he thought that they looked like monk cells.

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In 1668 he created a microscope with 250x. He is considered the father of microbiology, because he was the fist one observating bacteria in 1667; at first, bacteria were known as "animalcules" which was the name that he gave to them.
He was one of the first scientist disagreeing with the spontaneous generation theory.

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He was studying plant cells when he saw a structure that he didn't recognize. Even though no one had ever described its shape or function, Brown was pretty sure that this organelle was really important for the cell. He discovered the nucleus.

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He was a german botanist. In 1838 he concluded that all plants are formed by cells. In 1839, together with Theodor Schwann, he formulated the cell theory thanks to observations they did to the cells, such as the organisms were made up of cells and are basic structure in organisms.

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He totally refused the abiogenesis, as he demonstrated that tissues and organisms come from specific embrionaric cells in 1936. Thanks to his observations with Schleiden, they formulated the cell theory which was later completed by Virchow and Santiago Ramón y Cajal.

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He published a book in which he included the term "Omnis cellula e cellula"; this means that each cell stems from a preexisting cell. This originated the question: How was the first cell originated?

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He unified the cell theory when he proved that the nervous system was also formed by cells, which would later be known as neurones.