Igor Ivanovich Sikorsky (Russian: И́горь Ива́нович Сико́рский ; IPA: [ˈiɡərʲ ɪˈvanəvitɕ sʲɪˈkorskʲɪj], tr. Ígor' Ivánovič Sikórskij; May 25, 1889 – October 26, 1972), was a Russian American aviation pioneer in both helicopters and fixed-wing aircraft.