Keller is an aerospace engineer and graduate of the School of Engineering, University of California at Los Angeles. He received a Master of Business Administration degree from the University of California at Berkeley and a Master of Science degree in Management Science from the University of Southern California. Mr. Keller was a computer systems analyst at NASA's Jet Propulsion Laboratory in Pasadena, California, and developed a computer system for the management of resources for JPL's interplanetary exploration projects. The system was used for resources management in the Mariner, Viking and Voyager missions. His experience in the aerospace and construction industries led to the development of Space MAX: Space Station Construction Simulator, a project management simulator for the construction of the first commercial space station. Mr. Keller has also worked for Douglas Aircraft and British Aerospace.

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