Question: Who was the Soviet aircraft designer that worked with Leonid Kerber?
Context: Vladimir Grigoryevich Yermolaev (Russian: Владимир Григорьевич Ермолаев ), 1909–1944, was a Soviet aircraft designer, general-major of the aviation engineering service.  He graduated from the Moscow State University in 1931. Semyon Alekseyevich Lavochkin (Russian: Семён Алексе́евич Ла́вочкин ; September 11, 1900 - June 9, 1960), a Soviet aerospace engineer, Soviet aircraft designer who founded the Lavochkin aircraft design bureau.  Many of his fighter designs were produced in large numbers for Soviet forces during World War II. Arkadiy Dmitrievich Shvetsov (Russian: Аркадий Дмитриевич Швецов ) (January 25, 1892, Nizhniye Sergi, today's Sverdlovsk Oblast - March 19, 1953, Moscow) was a Soviet aircraft engine designer whose OKB was founded in Perm, USSR, in 1934, to produce the Wright Cyclone-derived Shvetsov M-25 engine.  Under Shvetsov, his OKB became the primary provider of radial piston engines for Soviet aircraft industry (Mikulin's and Klimov's OKB were assigned to creation of in-line engines).  After his death in 1953, the OKB was taken over by Pavel Soloviev. Andrei Nikolayevich Tupolev (Russian: Андрей Николаевич Туполев ; November 10, 1888 – December 23, 1972) was a pioneering Soviet aircraft designer. Konstantin Alekseevich Kalinin (Born December 17 (29) 1889 in Warsaw, died in 1938 or on April 21, 1940 in Voronezh) was a World War I aviator and Soviet aircraft designer. Alexei Andreyevich Tupolev (Russian: Алексе́й Андре́евич Ту́полев ; May 20, 1925 – May 12, 2001) was a Soviet aircraft designer who led the development of the first supersonic passenger jet, the Tupolev Tu-144.  He also helped design the Buran space shuttle and the long-range heavy bomber Tu-2000, both of which were suspended for lack of funding. Oleg Konstantinovich Antonov (Russian: Оле́г Константи́нович Анто́нов , ; 7 February 1906 – 4 April 1984) was a prominent Soviet aircraft designer, and the first chief of Antonov - a world-famous aircraft company in Ukraine, later named in his honour. Sergey Vladimirovich Ilyushin (Russian: Серге́й Владимирович Илью́шин ; 30 March [O.S. 18 March] 1894 – February 9, 1977) was a Soviet aircraft designer who founded the Ilyushin aircraft design bureau. Leonid Lvovich Kerber ( Körber) (Russian: Леони́д Льво́вич Ке́рбер ) (June 17, 1903— October 9, 1993) was a Soviet radioengineer, expert in aviation equipment, long-time co-worker of Andrei Tupolev and his deputy during 1953-1968. Admiral Flota Sovetskogo Soyuza Kuznetsov (Russian: Адмира́л фло́та Сове́тского Сою́за Кузнецо́в "Admiral of the Fleet of the Soviet Union Kuznetsov") is an aircraft cruiser (heavy aircraft-carrying missile cruiser, or TAVKR, in Russian classification) serving as the flagship of the Russian Navy.  She was built by the Black Sea Shipyard, the sole manufacturer of Soviet aircraft carriers, in Nikolayev within the Ukrainian Soviet Socialist Republic.  The initial name of the ship was Riga; she was launched as Leonid Brezhnev, embarked on sea trials as Tbilisi, and finally named "Admiral Flota Sovetskogo Soyuza Kuznetsov" after Admiral of the fleet of the Soviet Union Nikolay Gerasimovich Kuznetsov.
Answer: Andrei Tupolev