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Sara Imari Walker is an American theoretical physicist and astrobiologist with research interests in the origins of life, astrobiology, physics of life, emergence, complex and dynamical systems, and artificial life. Walker is currently Deputy Director of the Beyond Center for Fundamental Concepts in Science at Arizona State University, Associate Director of the ASU-SFI Center for Biosocial Complex Systems and an associate professor at Arizona State University (ASU). She is a co-founder of the astrobiology social network SAGANet.org, and on the board of directors for Blue Marble Space a nonprofit education and science organization. She has appeared on multiple media sources, such as "Through the Wormhole with Morgan Freeman", to communicate science to the public.