Lynn Margulis (1938–2011) was an American biologist and a prominent figure in the field of evolutionary biology. She is best known for her contributions to the understanding of symbiosis and the endosymbiotic theory, which proposes that certain organelles in eukaryotic cells, such as mitochondria and chloroplasts, originated as free-living bacteria that were engulfed by ancestral eukaryotic cells.
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Researcher in cellular evolution. Margulis, publishing as Lynn Sagan, developed an endosymbiotic account of eukaryotic-cell origins, connecting the distinct properties of organelles with formerly independent cellular partners.[ref]
On the origin of mitosing cells by Lynn Sagan. Author list and described study
Portrait of Lynn Margulis
. Jpedreira. CC BY-SA 2.5, via Wikimedia Commons. Source.