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Was awarded the Nobel Prize in Physics.
The award recognized his services to theoretical physics, especially the law of the photoelectric effect.

Theoretical physicist
PHOTO: Ferdinand Schmutzer / Wikimedia Commons · Public domain ↗The award recognized his services to theoretical physics, especially the law of the photoelectric effect.
He extended relativity into a new description of gravitation.
The papers addressed the photoelectric effect, Brownian motion, special relativity, and mass–energy equivalence.
The work helped establish the photon theory of light and later formed the specific basis of his Nobel Prize.