Reference:

Alamy: Dr. J. Robert Oppenheimer, the new director of the Institute for Advanced Study at Princeton, N.J., is shown in front of a blackboard full of mathematical formulas, Dec. 17, 1947

Which got edited into a Minecraft meme before:
Reddit.com: r/fakehistoryporn: Picture of J. Robert Oppenheimer taken as he completed the final design of the atomic bomb. (1944)