Their son, Chris Wirth, is founder of Liberty Puzzles, the largest American laser-cut jigsaw puzzle company, based in Boulder, Colorado.
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Stave Puzzles is the largest hand-cut jigsaw puzzle company in the USA, and perhaps in the world, but faces growing competition from laser-cutting companies like Liberty Puzzles and Artifact Puzzles that produce similar (but generally judged to be lower-quality) products at roughly a tenth of the cost.