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Roger R. Schell is an authority on high-assurance computing and spent more than 20 years in the U.S. Air Force before working in private industry. As one of the lead authors of the U.S. Department of Defense Trusted Computer System Evaluation Criteria (TCSEC), known as the Orange Book, Schell has first-hand knowledge of the standards required for classified computer systems. Published in 1983 by the National Computer Security Center, where he served as deputy director, the TCSEC was replaced in 2005 by an international standard, the Common Criteria for Information Technology Security Evaluation. The co-founder and vice president of Gemini Computers Inc., Schell led the development of the Gemini Multiprocessing Secure Operating System, known as GEMSOS. In 2001, he founded Aesec Corp., which acquired Gemini Computers and its security kernel in 2003. He also served as the corporate security architect at Novell. Marcus Ranum spoke with Schell, now a professor of engineering at the University of Southern California Viterbi School of ...