Janna Levin is an American theoretical physicist and author known for her work in cosmology and astrophysics. She has made significant contributions to the understanding of black holes and the nature of the universe. Levin is also recognized for her ability to communicate complex scientific ideas to the public through her writing and lectures. In addition to her research, Levin has authored several popular science books, including A Madman Dreams of Turing Machines and Black Hole Blues and Other Songs from Outer Space. She is a professor at Barnard College and has been involved in various outreach efforts to promote science education and literacy.