His mathematical analysis skills allowed him to gain international fame in a short period of time, including at Moscow State University and the Russian Academy of Sciences. Gelfand's Mathematical Seminary, of which he was a founding member immediately after World War I, has spawned many generations of world-class ma- thematicians for 45 years. Author of over 800 monographs. Honorary Member of the Moscow Mathematical Society, Doctor Honoris Causa of Oxford University, Doctor Honoris Causa of the Sorbonne University, Doctor Honoris Causa of Harvard University, Doctor Honoris Causa of Princeton University, Doctor Honoris Causa of Uppsala University, Doctor Honoris Causa of the University Lyon, Doctor Honors Causa of the University of Pisa. Honorary Member of the Moscow Mathematical Society, Honorary Member of the American Academy of Arts and Sciences, Honorary Member of the London Mathematical Society, Honorary Member of the US National Academy of Sciences, Honorary Member of the Royal Irish Academy, Honorary Member of the Swedish Royal Academy, Honorary Member of the French Academy of Sciences, Honorary Member of the Royal Community of London, Honorary Member of the Italian Academy of Sciences, Honorary Member of the Japanese Academy of Sciences, Honorary Member for Life of the New York Academy of Sciences, Member of the European Academy of Sciences.