what are the modern theo physicists doing?
Your question is much too broad to answer. Alot of modern theoretical physics is in areas like Quantum Mechanics, Cosmology, Superconductors and Nanotechnology, to name a few.
I notice you are new to Physicsforums.com. Welcome. You will find that you get much better answers if you ask specific questions. Its tough to answer broad questions without writings several paragraphs.
Have fun and enjoy.
Probably scratching their heads--not knowing where to turn.
They are doing everything and nothing at the same time
Separate names with a comma.