Oh, he worked on computers at an obscure company after a while.
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Did some locksmithing too IIRC. 
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From that essay:
One way to do this calculation is to use a discrete four-dimensional lattice to model a section of space-time. Finding the solution involves adding up the contributions of all of the possible configurations of certain matrices on the links of the lattice, or at least some large representative sample. (This is essentially a Feynman path integral.)
I 
Lattice Gauge Theory.
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