He solved one of the most famous math problems for which no solution existed.
The problem is called the Poincare conjecture. It comes from a mathematical field called topology. Unfortunately it is quite a complex problem even to describe, certainly to difficult for me.
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S. J. Perelman was born on February 1, 1904.
Grigori Roshal's birth name is Roshal, Grigori Lvovich.
Grigori Kozintsev's birth name is Kozintsov, Grigori Mikhailovich.
Laura Perelman died on April 10, 1970, in Flemington, New Jersey, USA.
Grigori is 6' 2 1/2".