In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Among this man's inventions are an improved gyrocompass and, with Leo Szilard, a refrigerator that cooled using only heat as an input. One formula attributed to this man states that energy equals Planck's constant times the frequency of radiation. Another states that in the same reference frame, gravity and acceleration are locally equal, and is known as the equivalence principle. A third formula states that rest energy equals mass times the square of the speed of light. For 10 points, name this Swiss physicist who explained the photoelectric effect, developed general relativity, and formulated the equation E equals m c squared.
Science