has he published any scientific studies?
Yes, "Folgerungen aus den Capillaritätserscheinungen".
Albert Einstein
In 1900, Einstein's paper "Folgerungen aus den Capillaritätserscheinungen" ("Conclusions from the Capillarity Phenomena") was published in the journal "Annalen der Physik". 
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. did he work in any universities? Yes, in University of Bern.
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Albert Einstein [SEP] First scientific papers
In 1900, Einstein's paper "Folgerungen aus den Capillaritätserscheinungen" ("Conclusions from the Capillarity Phenomena") was published in the journal "Annalen der Physik". On 30 April 1905, Einstein completed his thesis, with Alfred Kleiner, Professor of Experimental Physics, serving as "pro-forma" advisor. As a result, Einstein was awarded a PhD by the University of Zürich, with his dissertation "A New Determination of Molecular Dimensions". Also in 1905, which has been called Einstein's "annus mirabilis" (amazing year), he published four groundbreaking papers, on the photoelectric effect, Brownian motion, special relativity, and the equivalence of mass and energy, which were to bring him to the notice of the academic world, at the age of 26.