He got a punch in head then as result he draws geometry (he says by hand) like this:
I googled for him and I do not see any math (written formula, solved problems) from him, only drawn geometric stuff, that he sells here:
http://fineartamerica.com/profiles/jason-padgett.html
Also he wrote a book about his story. Journalists liked to make his story viral.
I read that only 40 people in the world are known to become like this (basically, asperger autistic superpowers) after trauma. I would not try getting punched with the hope of becoming geometry artist, as the probability is very low. However, new technologies may allow selective brain surgery in a future, who knows - if you need to draw circles like this guy for any reason.