Which scientist used a simple light microscope?

The scientist most famously associated with using a simple light microscope is Antonie van Leeuwenhoek. He is often credited with significantly advancing the field of microscopy in the late 17th century. Van Leeuwenhoek crafted his own simple microscopes, which were powerful for their time, and used them to observe and document microorganisms, blood cells, and other microscopic structures. His work laid the foundation for microbiology.