Symbiotic Earth conveys one of the most important biographies of the last 50 years. It’s no exaggeration to say that Lynn Margulis’ contribution to science is in the same league as Jim Watson, Francis Crick, Stephen Hawking and Barbara McClintock. It profiles a contrarian woman who was a force of nature, without indulging in sentimentality or bitterness about how long it took for her ideas to get accepted. Everyone who is interested in living things, evolution, or the environment must watch this film. In this interview, I talk to John about his film and his history with Lynn Margulis.