Jack's Old South cookers were made by an engineer named Britt. He had a monopoly on some kind of valve used in blast furnaces for steel mills. I believe he was from Birmingham. He bought out the company that made rotisserie cookers with the "ring of flame" so he could have the patent. His team, Britt's BBQ, won reserve grand at Jack Daniels in 2006.
Myron Mixon Smokers are made by a company in Waterford, CT, called Seconn Fabrications, so it is an entirely new operation. Myron likes to use full size aluminum foil steam table pans, so all his cookers are designed to have room for these pans.