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Hans & Zacharias Janssen - Dutch Spectacle Makers 1590 They discovered the compound microscope, which was a combination of two lenses fitted to the ends of a tube. This invention had magnifications higher than that of previous types of microscopes that can only magnify as high as 10x.
Robert Hooke - English Scientist 1665 Hooke was the first human to observe cells. Using a rudimentary compound microscope, he saw the dead cells in a slice of cork. He named them cells due to their 'room' or 'compartment' like shapes.
Anton van Leeuwenhoek - Dutch Scientist 1683 Leeuwenhoek improved upon the microscope's design and thanks to this, was able to observe microscopic life, such as protists and bacteria.
Matthias Jakob Schleiden - German Botanist 1838 Theorized that all plants and their tissues are composed of cells. This states that cells are the building blocks of every part of a plant. This is the first general statement about what cells are.
Theodor Schwann - German Botanist 1839 Unified previous cell theories by discovering that both plants and animals are composed of cells, ending debates in the difference of their structures. He states that all organisms are composed of cells, and cells are the basic unit of structure of every organism.
Rudolf Virchow - German Physiologist 1855 Virchow added a new portion to the existing cell theory -- Cells can only come from previous living cells, and that diseased cells come from healthy ones.
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