Zacharias Jenssen, an eye glass maker, created the first compound microscope. He created the first part of the Cell Theory. That part states that all living things are composed of cells.
Robert Hooke, an English philosopher, was known for putting a piece of cork under his microscope and seeing ''tiny rectangular room'' like shapes. Those room like shapes are called cells
Anton Van Leeuwenhoek, a Dutch tradesman and scientist, was believed to be the first microbiologist. He is known as ''The Father of Microbiology.
Matthias Schleiden, a German botanist, discovered the second part of the Cell Theory. That part states that cells are the basic units of structure and function in living things.
Theodor Schwann studied plants. After a while of studying plants under his microscope he realized that all of the plants were made up of cells. He also found out that animal tissue was made up of cells too.
Rudolph Virchow discovered the last part of the Cell Theory. That part states that all cells are made of preexisting cells. He also discovered/created many more things like advancing dental health.