What’s the big band theory and who came up with it?

If you meant the science term it would be the answer below. If you mean the TV show, ( thx google for helping) Mensa-fied best friends and roommates Leonard and Sheldon, physicists who work at the California Institute of Technology, may be able to tell everybody more than they want to know about quantum physics, but getting through most basic social situations, especially ones involving women, totally baffles them.