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Roger is a retired systems architect / engineer. In a diverse 40-year career, he has been an IBM QA engineer, a US Army systems analyst, a graduate research assistant in parallel processors and operating systems, a Boeing Aerospace systems software engineer, a compiler engineer and code generation expert, and, after moving to Silicon Valley, a microprocessor architect and systems engineer for half a dozen tech companies in the SF Bay Area. Now retired, he pursues writing and independent research on climate change, sustainable development, and advanced space systems.