Cell Theory Marcus Mao

Jansen (exact date unknown)

Jan 1, 1595

Created the compound microscope.
Jansen's Wikipedia Page

Hooke (exact date unknown)

Sep 1, 1665

Published his book Micrographia, which detailed many of his descoveries, including seeing cork cells and naming them.
Micrographia's Wikipedia Page

Redi (exact date unknown)

Jan 1, 1668

Helped disprove spontaneous genration by showing that maggots do not form from rotting meat.
Redi's Wikipedia Page

Leeuwenhoek

Sep 7, 1674

Saw algae and named them "animalcules ".
Leeuwenhoek UCMP Biography

Turpin (exact date unknown)

Jan 1, 1829

Observed cell division in algae.

Brown (exact date unknown)

Jan 1, 1831

Discovered and named the nucleus
Brown's Wikipedia Page

Remak (exact date unknown)

Jan 1, 1838

Discovered that all cells come from pre-existing cells.

Schwann (exact date unknown)

Jan 1, 1839

Created part of cell theory with Schleiden
Schwann's Wikipedia Page

Schleiden (exact date unknown)

Jan 1, 1839

Created part of cell theory with Schwann

Schleiden's Wikipedia Page

Mohl (exact date unknown)

Jan 1, 1844

Discovered protoplasm.

Virchow (exact date unknown)

Jan 1, 1855

Plagarized and published Remak's theory of all cells originating from a pre-existing cell.
Virchow's Wikipedia Page

Pasteur (exact date unknown)

Jan 1, 1859

Disproved spontaneous generation.

Mendel (actually 1856-1863)

Jan 1, 1860

Performed many genetic experiments on pea plants.

Schneider (exact date unknown)

Jan 1, 1873

Observed cell division.

Golgi (exact date unknown)

Jan 1, 1898

Discovered the Golgi apparatus.