I want to know the answer to the following question:
What was Feynman's PhD thesis titled?
All the background I'm provided with is that "Feynman's thesis applied the principle of stationary action to problems of quantum mechanics, inspired by a desire to quantize the Wheeler–Feynman absorber theory of electrodynamics, laying the groundwork for the "path integral" approach and Feynman diagrams, and was titled "The Principle of Least Action in Quantum Mechanics".". Is that enough to answer the question?
Answer: yes