lots of blatant clues about gravity, physics, relativity, Newton, and the other extremely famous guy must be either Maxwell, Bolzman, Einstein, Bohr, Dirac, Heisenberg, or Feynman.
Even time travel in Back to the Future is a clue. But what is that building? Does not look like Einstein territory.
Doc Brown in the original Back to the Future named his dog after a famous gravity guy. A guy on your list.