Margulis is best known and best remembered for her endosymbiotic theory. You know what this is because you took basic biology and it is now part of every textbook. Notably, at the time Margulis published this idea, it was rejected and continued to be shunned for some time, but eventually was accepted. Margulis made a number of other important and accepted contributions to evolutionary biology.
Margulis has also pressed forward with a number of other theories (either hers, or as an advocate for others) that are just plain wacky. But they only deserve the briefest of mention at this time of her death.
Margulis, who began her University training at the University of Chicago at the age of 14, earned an MA from Madison and a PhD from Berkeley (1963) won the National Medal of Science, was a member of the National Academy, and had many other awards and accolades. She was married to Carl Sagan, and their children are well known for their various contributions to science, science writing, and technology.
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Image from wikipedia
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