the cell theory By jackie7 Period: Jan 1, 1500 to Dec 31, 1900 1500-1900 Feb 15, 1564 galileo he was an italian astromoner, physists, mathmatitian, and inventor. May 2, 1602 anthanasius kirchir he studied volcanoes and fosils. Oct 24, 1632 anton van leuwenkoek Oct 13, 1821 rudolph virchow discovered lukemia cells