Zach and Hans Janssen created the microscope.
Robert Hook had a microscope and a cork, So when he decided to look at it under the microscope, he discovered that there were dead cells in the cork.
Leeuwenhoek created the simple microscope with a tiny lens that could magnify objects up to 266 times.
Matthias Schlelden learned that all plants are made of cells
Theodore Shwann discovered that all animals are made of cells and eventually worked with schlieden