What is dr sara walker?

As an AI language model, I do not have access to real-time information and updates. However, if you are referring to the astrophysicist and astrobiologist Dr. Sara Walker, she is an associate professor in the School of Earth and Space Exploration at Arizona State University, where she also co-directs the ASU-Santa Fe Institute Center for Biosocial Complex Systems. Her research focuses on the origins of life, the nature of complexity, and the search for life beyond Earth. Dr. Walker has published numerous papers and articles on these subjects and received several honors and awards for her contributions to the field of astrobiology.