In addition to contributing to that path-integral formulation of quantum mechanics, this man won the Nobel Prize with Schwinger and Tomonaga for contributions to quantum electrodynamics.
This man names a theorem for calculating the derivative of an energy eigenvalue with respect to an arbitrary parameter along with Hellmann. He completed a theory in which the propagator is proportional to the complex exponential of the action along a trajectory. In addition to contributing to that path-integral formulation of quantum mechanics, this man won the Nobel Prize with Schwinger and Tomonaga for contributions to quantum electrodynamics. Photons are represented by wavy lines in a set of diagrams named for him. For 10 points, name this American physicist known for his Lectures on Physics, along with a book whose title asks whether he is joking.
This man names a theorem for calculating the derivative of an energy eigenvalue with respect to an arbitrary parameter along with Hellmann.
Richard Philips Feynman