That reminds me of another wolf, Gene Wolfe. He wrote some of the most complex and critically praised science fiction to date, and most of his famous works were done in his free time while working as an industrial engineer. Or for that matter, a certain patent clerk who wrote some really fine physics papers.

Other examples: Baruch Spinoza, lensmaker by day, philosopher by night. Philip Glass: moving man, plumber, cab driver, and avant-garde composer. E. E. "Doc" Smith: food engineer and science fiction writer. Franz Kafka: administrator in an insurance company, and writer of history's weirdest books. Wallace Stevens: insurance company executive and poet. William Carlos Williams: doctor and poet. And these are just off the top of my head.