Neil deGrasse Tyson, a great American astrophysicist, author and science populariser, is a proponent of scientific enlightenment. Go ahead and download free pdf or epub of Neil deGrasse Tyson Books from this website. He got his doctorate from Columbia University and then proceed in research for stellar evolution and galaxies. He's also known for his role as director of the Hayden Planetarium and for hosting the popular science series Cosmos: A Spacetime Odyssey.