Walter SierraProlific author and space transportation systems expert with 45+ years of progressive experience in systems engineering and integration of aerospace and defense systems, systems analysis and trade studies, formulation of system requirements, verificaion, and validation. Walter Sierra has worked in a variety of assignments from staff engineer to branch supervisor, in locations from major rocket firms in California to the halls of the Pentagon in Washington, D.C., and many places in between. Author of a four-book series (2021) entitled Beyond the Saga of Rocket Science which is easily readable for those interested in the history of the world's space programs: (1) The Dawn of the Space Age, (2) Avoiding Armageddon, (3) In Space To Stay, (4) The Never-Ending Frontier. These books have received excellent reviews by Kirkus Reviews, the US Review of Books, Foreword Clarion Reviews, Pacific Book Review, and Blue Ink Review. Author Website: https: //www.waltersierra.com Read More Read Less