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Sergey's father Michael was prof of mathematics at Maryland University. His mother, Eugenia, was an analyst at NASA Goddard Space Flight Center. His family came from Russia around 1967 due to persecution against Jews. Sergei was born in Moscow.
http:// somvweb.som.umaryland.edu/absolutenm/templates/?a=548
http:// bornrich.com/sergey-brin.html