Kuzmin was born in Moscow, son of the architect Vladimir Legoshin and the literary critic Edwarda Kuzmina; among his grandparents were the critic Boris Kuzmin and the prominent literary translator Nora Gal.
Kuzmin, a native of Moscow, is the offspring of architect Vladimir Legoshin and literary critic Edwarda Kuzmina. His grandparents include critic Boris Kuzmin and renowned translator Nora Gal.