did he work in any universities?
Yes, in University of Bern.
Albert Einstein
By 1908, he was recognized as a leading scientist and was appointed lecturer at the University of Bern.
what is the meaning of general relativity? The geometric theory of gravitation. who was the first to put forward this study? Albert Einstein what were his major contributions to science? Mass–energy equivalence formula and theory of the photoelectric effect.
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Albert Einstein [SEP] Academic career
By 1908, he was recognized as a leading scientist and was appointed lecturer at the University of Bern. The following year, after he gave a lecture on electrodynamics and the relativity principle at the University of Zurich, Alfred Kleiner recommended him to the faculty for a newly created professorship in theoretical physics. Einstein was appointed associate professor in 1909. Einstein became a full professor at the German Charles-Ferdinand University in Prague in April 1911, accepting Austrian citizenship in the Austro-Hungarian Empire to do so. During his Prague stay, he wrote 11 scientific works, five of them on radiation mathematics and on the quantum theory of solids.