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Warren retired following two rewarding careers. After being tethered to Cornell University for 30 years, including time as a student, he resigned as a professor and spent the next 20 years as a scientist with the federal government. Among his retirement activities was a well-illustrated and often humorous (usually by intent) "Retired--Now What?" Blog, as well as contributions to other websites. He stopped adding to his blog at 500 posts and started thinking about writing an ebook.