Some history on cell theory worth mentioning.

Endosymbiotic Theory:- 

The endosymbiotic theory states that chloroplasts and mitochondria are the result of years of evolution initiated by endocytosis of bacteria and the blue- green algae as they did not become digested but becames symbionts living within the host.

Mitochondria- from proteobacteria.

Chloroplasts- from cyanobacteria.

http://learn.genetics.utah.edu/content/begin/cells/organelles/

Matthias Jakob Schleiden:-

 

Studied the structure of the plant cell and wrote  “Contributions to Phytogenesis”  (1838) in which he stated that differnet parts of a plant organism is made up of cells. He recognized the importance of the cell nucleus and it’s connection with cell division and was also one of the first scientist to accept Darwin’s theory of evolution. 

http://en.wikipedia.org/wiki/Matthias_Jakob_Schleiden

Theodor Schwann:- 

German physiologist who concluded that “all living things are composed of cells and cell products”. Concluded that nails, tooth enamel and feathers ll have cellular origins. He discovered what is now know as Schawnn Cells in the nervous system, discovered pepsin, organic nature of yeast, and coined the term “metabolism”. He also examined “spontaneous generation” and disproved it. 

http://en.wikipedia.org/wiki/Theodor_Schwann

Rudolf Virchow:-

The first to recognize leukaemia cells and built on the works of Theodore Schawnn. He encapsulated his work into the epigram “Omnis cellula e cellula” – every cell originates from another existing cell like it and “Omne vivum ex ovo”- Everything comes from a living thing” He also published work on cell theory which was not his own. 

http://en.wikipedia.org/wiki/Rudolf_Virchow