<p>Paolo Ulivi was born in Florence, Italy and graduated from the Politecnico di Milano University with a thesis on robotics for Mars sample return missions. He works as a consultant in aerospace structures in Toulouse, France. In his free time, he researches the history of astronautics, astronomy, aeronautics and the Cold War. He is also an amateur astronomer and specializes in Solar System observations.</p><p>David Harland studied astronomy to degree level, and pursued a career lecturing in computer science, and academic and industrial research. In 1995, David "retired" to resume his interest in spaec and started to write. He has over two dozen books published to date, a majority of them with Springer/Praxis and several others under contract. These days he considers himself to be an amateur hermit and a professional space historian.</p>