He was born in Chicago on March 9, 1943. His father, a German-born physicist Gerhardt Fischer and mother Regina divorced when he was two years old. He was brought up by his Jewish mother in Brooklyn. Her son developed a hatred against Jews that became more virulent as he grew older. Nonetheless, mother and son evidently kept in touch over the years, and when she died in 1997, Fischer was said to have been distraught. His sister Joan, who bought him his first chessboard when he was six, died soon after and two losses further taxed his fragile hold on rationality. Having never married or had children, Fischer leaves no immediate survivors.