The son of a chief of the Office of International Relations of the USSR State Committee Ionovich Dmitri Prokhorov and employees of the Department of Polymers of the Moscow Institute of Chemical Engineering TamaraMikhailovna Kumaritovoy. His sister - Irina Prokhorova critic, editor and publisher of the magazine "New Literary Review". Prokhorov ancestors on his father - the peasants of Smolensk, the grandfather in the Stolypin eraProkhorov moved to Siberia, they made a strong economy, but later dropped it and fled under threat ofexpropriation.On the maternal side - scientists and doctors: his grandfather was Michael G. KumaritovDagestan People's Commissar of Health, in 1934-1936 - director of the Dagestan Medical Institute, and my grandmother, Anna Belkin Isaakovna microbiologist and a student of the famous Professor Zilber, however herscientific career and has not developed. During World War II she remained in Moscow, where he engaged in manufacturing vaccines, and his daughter Tamara sent to evacuation.