The brothers Arkady Natanovich Strugatsky (Russian: Аркадий Натанович Стругацкий; 28 August 1925 – 12 October 1991) and Boris Natanovich Strugatsky (Russian: Борис Натанович Стругацкий; 14 April 1933 – 19 November 2012) were Soviet-Russian science-fiction authors who collaborated through most of their careers. Source: Wikipedia (en)