Crazy Jim Groh Auto 5371 S 27th St, Greenfield, WI53221 With a name like Crazy Jim you know there has to be a good story. Opening his first car dealership when he was in his…More twenties, Jim Groh got the nickname Crazy Jim when he sold cars at below cost. In 1974 he legally changed his name to the nickname and became a Milwaukee legend, once even running for Governor of Wisconsin. Today the used car dealership is run by his son, James Groh, and the tradition of selling quality used cars at great prices continues. Stop by the dealership to see the great selection of vehicles. Financing is available on-site.