Etosha R. Cave is an American mechanical engineer based in Berkeley, California. She is the co-founder and chief science officer of Twelve (formerly known as Opus 12) a startup that recycles carbon dioxide. During her Ph.D. studies at Stanford University, she worked on electrochemical approaches that could be used to convert carbon dioxide and water into useful plastics and household cleaners. She built a gas analysis system that could determine the composition of electrochemical reactions in real-time and earned her Ph.D. in 2015. While at Stanford, Cave co-founded Twelve, a start-up that uses metal catalysts to recycle carbon dioxide. Today Twelve is based at the Lawrence Berkeley National Laboratory and has secured several academic partnerships, including funding from the National Science Foundation and I-Corps program.