1. Cell Theory Robert Hooke 1635—1703
English physicist, mathematician, and inventor. In (1665) he described his microscopic observations of plant tissues.
Hooke coined the term cell.Hooke used the microscope to look at dead cells. He prepared a thin section of cork for viewing. What he saw was the remaining cell wall. He compared it to the monastery cells.

2. Anton van Leeuwenhoek (1632-1723)
Cell Theory
Anton van Leeuwenhoek ( )
Dutch microscopist
AKA: Antony van Leeuwenhoek was an unlikely scientist. Yet with skill, diligence, an endless curiosity, Leeuwenhoek succeeded in making some of the most important discoveries in the history of biology. It was he who discovered bacteria in 1676, his observations on the plaque between his own teeth, "a little white matter, which is as thick as if 'twere batter." He repeated these observations on two ladies (probably his own wife and daughter), and on two old men who had never cleaned their teeth in their lives. Leeuwenhoek found "an unbelievably great company of living animalcules, These were among the first observations on living bacteria ever recorded. He observed and recorded living cells for the first time.

3. Cell Theory R.J.H Dutrochet
French Physician who in 1824 made the connection between plant cells and animal cells explicit, and he proposed that the cell was not just a structural but also a physiological unit
AKA: Henri Dutrochet
Basically all living things are made up of cells and cells are independent self-sufficient and that the growth of tissue is due to the growth of cells.
R.J.H Dutrochet

4. Cell Theory Felix Dujardin
In 1835 He was the first to group single-cell animals and named them as "Rhizopoda", which is now called as protozoans. He said single-celled organisms are self-sufficient living things.
Felix Dujardin

5. Matthias Schleiden (1804-1881)
Cell Theory
Matthias Schleiden ( )
German botanist
Trained as a lawyer, he soon left the profession to study natural science.He made the statement that plant cells were made of living cells in 1838.
He and Theodor Schwann developed a large part of cell theory, which states that all living organisms are composed of cells or substances made by cells.

6. Cell Theory Theodor Schwann 1810 - 1882
German physiologist
He founded modern histology by recognizing the cell as the basic unit of animal structure A year after Mathias Jacob Schleiden, a colleague Schwann knew well, advanced the cell theory for plants, Schwann extended it to animals. He said that animals were made of cells.

7. Cell Theory Schleiden and Schwann
Developed the part of cell theory that says. The cell is the basic unit of structure and function of all living things.

8. Cell Theory Rudolf Virchow
German pathologist,
anthropologist, and statesman
Twenty years later in 1855 Rudolf Virchow proposed an important extension of cell theory that "All living cells arise from pre-existing cells". ("Omnis cellula e cellula") This statement has become what is known as the "Biogenic law".

9. Cell Theory Abiogenesis Life comes from non-living things.
Rags to rats
Meat to maggots

10. Cell Theory Lynn Margulis
Her contribution to cell theory is still ongoing but is credited to the year 1970.
The Endosymbiotic Theory was first proposed by former Boston University Biologist Lynn Margulis in the 1960's and officially in her 1981 book "Symbiosis in Cell Evolution".  Although now accepted as a well-supported theory, both she and the theory were ridiculed by mainstream biologists for a number of years.  Thanks to her persistence, and the large volumes of data that support this hypothesis gathered by her and many other scientists over the last 30 years, biology can now offer a plausible explanation for the evolution of eukaryotes. Basically said that two of the special organelles in plant and animal cells (Chloroplast and Mitochondrion both have their own DNA and were once single celled organisms that have evolved into parts of the Eukaryotic cell)

11. Cell Theory All living things are composed of cells
Cells are basic unit of structure and function in living things
Cells come from other living cells
Credit for cell theory development usually is given to only three of the scientist “Schleiden, Schwann, and Virchow”
But many others have made huge contributions and continue to add to cell theory.

12. Cell Organization Organelles Cells Tissue Organs Organ Systems
Organisms

13. Additional information:
The Microscope
Zaccharias Janssen Invented the microscope
Robert Hooke -Referred to as the English father of microscopy improved on Janssens microscope in middle 1600s
Anton van Leeuwenhoek -Referred to as the Father of microscopy – Improved on microscope in late 1600’s