So, you want to become a theorist?

The distinguished physicist Gerard ‘t Hooft (pronounced with a long o as in “over”) made a more comprehensive list than I ever could (and with the reputation to boot), so here is his page:

If you have never heard of Dr. Hooft, he is a Nobel winning theoretical physicist from the Netherlands. His interests include gauge theories in elementary particle physics, quantum gravity and black holes, and foundational aspects of quantum mechanics.