Theodor Schwann and matthias Schleiden
In 1839 cell theory was articulated by Schleiden and Schwann. in 1838 they described plant cells with a nuclei. 1839 Schwann published his book about plant and animal cells.
The first two tenets were right the third was wrong. The correct interpretation for the cell formation by division was formally enunciated in his powerful dictum
1665 discoverd the cellular composition of cork and introduced the world to cell science
Anton van leevwen hoek
1674 improved magnification of microscope.1676 discovered animaclues.1683 discovered bacteria from a sample of his own saliva