Question:  Lunar Expeditionary Complex was proposed by which designer of Soviet rocket engines?
Context: Reaction Motors, Inc. (RMI) was an early American maker of liquid-fueled rocket engines, located in New Jersey.  RMI engines with 6000 lbf thrust powered the Bell X-1 rocket aircraft that first broke the sound barrier in 1947, and later successors including the X-1A, X1E, and the Douglas D-558-2 Skyrocket.  A 20000 lbf thrust RMI engine also powered the Viking research rocket, the first large liquid-fueled US high-altitude rocket.  RMI was merged with Thiokol in 1958, where it produced the XLR-99 engine that powered the X-15 rocket aircraft. NPO Energomash “V. P. Glushko” is a major Russian rocket engine manufacturer.  The company primarily develops and produces liquid propellant rocket engines.  Energomash originates from the Soviet design bureau OKB-456, which was founded in 1946.  NPO Energomash acquired its current name on May 15, 1991, in honor of its former chief designer Valentin Glushko. The Soviet crewed lunar programs were a series of unsuccessful programs pursued by the Soviet Union to land a man on the Moon, in competition with the United States Apollo program to achieve the same goal set publicly by President John F. Kennedy on May 25, 1961.  The Soviet government publicly denied participating in such a competition, but secretly pursued two programs in the 1960s: crewed lunar flyby missions using Soyuz 7K-L1 (Zond) spacecraft launched with the Proton-K rocket, and a crewed lunar landing using Soyuz 7K-LOK and LK Lander spacecraft launched with the N1 rocket.  Following the dual American successes of the first crewed lunar orbit on December 24–25, 1968 (Apollo 8) and the first Moon landing on July 20, 1969 (Apollo 11), and a series of catastrophic N1 failures, both Soviet programs were eventually brought to an end.  The Proton-based Zond program was canceled in 1970, and the N1 / L3 program was terminated de facto in 1974 and officially canceled in 1976.  Details of both Soviet programs were kept secret until 1990 when the government allowed them to be published under the policy of "glasnost". An airbreathing jet engine (or "ducted jet engine") is a jet engine propelled by a jet of hot exhaust gases formed from heated and expanded air that is drawn into the engine via a compressor, typically a centrifugal or axial type.  They are typically gas turbine engines.  The opposite of airbreathing jet engines are non-airbreathing jet engines, such as rocket engines, for example, which are propelled by a jet of hot gases created by the chemical reaction of two or more compounds internally.  While the majority of the mass flow of an airbreathing jet engine is provided by air taken from outside of the engine and heated internally, using energy stored in the form of fuel, a rocket engine's fuel provides both the energy and the mass flow to create thrust. Arthur Valentine Cleaver OBE FRAeS (14 February 1917 – 16 September 1977) was a distinguished British rocket engineer.  He co-authored a paper which discussed the possibilities and problems of nuclear rocket engines in 1948.  After the Second World War he developed de Havilland's Sprite and Spectre rocket engines.  He moved to Rolls Royce in 1957 and in 1960 he became general manager and chief engineer of the Rolls Royce's rocket departments, where he was responsible for the engines which powered the Blue Streak missile and Black Arrow launch vehicle.  While the ELDO vehicle was ultimately unsuccessful and abandoned, the Blue Streak vehicle and its engines worked perfectly on every launch, and Cleaver was awarded the OBE for his part in developing them. The NK-33 and NK-43 are rocket engines designed and built in the late 1960s and early 1970s by the Kuznetsov Design Bureau.  The NK designation is derived from the initials of chief designer Nikolay Kuznetsov.  The NK-33 was among the most powerful LOX/RP-1 rocket engines when it was built, with a high specific impulse and low structural mass.  They were intended for the ill-fated Soviet N-1 rocket moon shot.  The NK-33A rocket engine is now used on the first stage of the Soyuz-2-1v launch vehicle. A rocket engine is a type of jet engine that uses only stored rocket propellant mass for forming its high-speed propulsive jet.  Rocket engines are reaction engines, obtaining thrust in accordance with Newton's third law.  Most rocket engines are internal combustion engines, although non-combusting forms (such as cold gas thrusters) also exist.  Vehicles propelled by rocket engines are commonly called rockets.  Since they need no external material to form their jet, rocket engines can perform in a vacuum and thus can be used to propel spacecraft and ballistic missiles. Valentin Petrovich Glushko (Russian: Валенти́н Петро́вич Глушко́ , "Valentin Petrovich Glushko"; Ukrainian: Валентин Петрович Глушко , "Valentyn Petrovych Hlushko"; born 2 September 1908 – 10 January 1989), was a Soviet engineer, and designer of rocket engines during the Soviet/American Space Race. Korolev is a large lunar crater of the walled plain or basin type, named for Soviet rocket engineer Sergey Korolyov.  It lies on the far side of the Moon, and the northern part of its floor crosses the lunar equator.  Notable nearby craters include Galois just to the southeast, Das to the south-southeast, Doppler attached to the southern rim, and Kibal'chich to the northeast.  Rays of the crater Crookes (to the southwest) cover parts of the basin. The LEK Lunar Expeditionary Complex was a lunar expedition and moonbase proposed by Valentin Glushko in 1974 as a Soviet response to the United States' Apollo program and as successor of Zvezda moonbase that based on closed N1-L3 manned moon expedition program.  If implemented, it was intended to have been operational by 1980 and used for scientific and engineering research.
Answer: Valentin Petrovich Glushko