One of this man's innovations relies on the Green's function methods allowed by Wick's theorem. Along with Smoluchowski, this man is credited with theorizing a device to extract work from Brownian motion, his namesake ratchet. This man came up with a graphical representation of Moller scattering. He piggybacked on the work of Dirac to complete the 
One of this man's innovations relies on the Green's function methods allowed by Wick's theorem. Along with Smoluchowski, this man is credited with theorizing a device to extract work from Brownian motion, his namesake ratchet. This man came up with a graphical representation of Moller scattering. He piggybacked on the work of Dirac to complete the path integral formulation of quantum mechanics. For 10 points, name this physicist whose namesake diagrams depict the behavior of subatomic particles using straight and squiggly lines.
One of this man's innovations relies on the Green's function methods allowed by Wick's theorem.
Richard Feynman