Dr. Jerry Jon Sellers is the author of Understanding Space: An Introduction to Astronautics, a contributing author and editor of Applied Space Systems Engineering, and a contributing author of Human Spaceflight Analysis and Design. He has over 30 years of space systems experience including Guidance & Onboard Navigation Officer in Space Shuttle Mission Control; Assistant Professor of Astronautics at the U.S. Air Force Academy; and Chief of Astronautics for the Air Force European Office of Aerospace Research & Development. He is an Associate Fellow at AIAA and the former Chairman of the Space Systems Technical Committee. Jerry is a certified Scaled Agile Program Consultant and a corresponding member of the International Academy of Astronautics. He is also an adjunct professor at Stevens Institute of Technology.