Question: Frederic de Hoffmann assisted which Hungarian-American physicist in the development of the hydrogen bomb?

Context paragraphs:
Salted bomb: A salted bomb is a nuclear weapon designed to function as a radiological weapon, producing enhanced quantities of radioactive fallout, rendering a large area uninhabitable.  The term is derived both from the means of their manufacture, which involves the incorporation of additional elements to a standard atomic weapon, and from the expression "to salt the earth", meaning to render an area uninhabitable for generations.  The idea originated with Hungarian-American physicist Leo Szilard, in February 1950.  His intent was not to propose that such a weapon be built, but to show that nuclear weapon technology would soon reach the point where it could end human life on Earth.  No intentionally salted bomb has ever been atmospherically tested, however the UK tested a 1 kiloton bomb incorporating a small amount of cobalt as an experimental radiochemical tracer at their Tadje testing site in Maralinga range, Australia, on September 14, 1957.  Furthermore the triple "taiga" nuclear salvo test, as part of the preliminary March 1971 Pechora–Kama Canal project, produced substantial amounts of Co-60, with this fusion generated neutron activation product being responsible for about half of the gamma dose now (2011) at the test site.

List of things named after Edward Teller: This article is a list of things named after Edward Teller Hungarian-American theoretical physicist, regarded by some as "the father of the hydrogen bomb".

Frederic de Hoffmann: Frederic de Hoffmann (b. Vienna, July 8, 1924 – d. La Jolla, October 4, 1989) was a nuclear physicist who worked on the Manhattan Project.  He came to the United States of America in 1941 and graduated from Harvard in 1944.  Upon graduating, de Hoffmann was sent to Los Alamos National Laboratory where he assisted Edward Teller in the development of the Hydrogen bomb.  Frederic de Hoffmann was an advocate of peaceful atomic energy.

W21: The W21 was an hydrogen bomb design for the US military.  It would have used the physics package of the TX-21 bomb.  The TX-21 was a weaponized version of the "Shrimp" device tested in the Bravo shot of Operation Castle.  A TX-21C was tested as the Navajo shot, Operation Redwing.  The TX-21, was a scaled-down version of the Runt device (M-17 hydrogen bomb).  Smaller in size and weight to the Mk-17, the Mk-21 was considered as a potential missile warhead.  Far more powerful than the TX-13, which was a high-yield atomic bomb developed from the Mk-6 bomb, the XW21 was to replace the XW13 in the weapons pod of the B-58 bomber and for the SM-64 Navaho missile.

Edward Teller: Edward Teller (Hungarian: "Teller Ede" ; January 15, 1908 – September 9, 2003) was a Hungarian-American theoretical physicist who was born in Hungary, and is known colloquially as "the father of the hydrogen bomb", although he claimed he did not care for the title.  He made numerous contributions to nuclear and molecular physics, spectroscopy (in particular the Jahn–Teller and Renner–Teller effects), and surface physics.  His extension of Enrico Fermi's theory of beta decay, in the form of Gamow–Teller transitions, provided an important stepping stone in its application, while the Jahn–Teller effect and the Brunauer–Emmett–Teller (BET) theory have retained their original formulation and are still mainstays in physics and chemistry.  Teller also made contributions to Thomas–Fermi theory, the precursor of density functional theory, a standard modern tool in the quantum mechanical treatment of complex molecules.  In 1953, along with Nicholas Metropolis, Arianna Rosenbluth, Marshall Rosenbluth, and Augusta Teller, Teller co-authored a paper which is a standard starting point for the applications of the Monte Carlo method to statistical mechanics.

Project Brass Ring: Project Brass Ring was a 1950 United States Air Force project designed to deliver an early hydrogen bomb to within 2 miles of a target using a drone version of the B-47 Stratojet, which would be guided by a mother ship and destroyed in the detonation.  This project was given considerable support, due to uncertainty concerning the possible yield of a hydrogen bomb, then estimated to lie between 10 and 40 megatons.  Brass Ring was meant to provide an interim nuclear weapons delivery capability while more capable (and less costly) systems were under development.  The fear and concern surrounding the Soviet Union's development of its own nuclear weapons capability was the impetus to quickly begin the project.

Two Bombs, One Satellite: Two Bombs, One Satellite (Chinese:两弹一星) was an early nuclear and space project of the People's Republic of China.  "Two Bombs" refers to the Atomic bomb (and later the Hydrogen bomb) and Intercontinental Missile, while "One Satellite" refers to artificial satellites.  China tested its first atomic bomb and hydrogen bomb in 1964 and 1967 respectively, while in 1970 the country successfully launched its first satellite (DFH-1).  23 scientists involved in the project was awarded the title "Two bombs and one Satellite Award" (Chinese:两弹一星功勋奖章) in 1999.

J. Carson Mark: Jordan Carson Mark (July 6, 1913 – March 2, 1997) was a Canadian-born mathematician best known for his work on developing nuclear weapons for the United States at the Los Alamos National Laboratory.  Mark joined the Manhattan Project in 1945, and continued to work at Los Alamos under the leadership of Norris Bradbury after World War II ended.  He became the leader of the Theoretical Division at the laboratory in 1947, a position he held until 1973.  He oversaw the development of new weapons, including the hydrogen bomb in the 1950s.  On the hydrogen bomb project he was able to bring together experts like Edward Teller, Stanislaw Ulam and Marshall Holloway despite their personal differences.

Thermonuclear weapon: A thermonuclear weapon is a second-generation nuclear weapon design using a secondary nuclear fusion stage consisting of implosion tamper, fusion fuel, and sparkplug which is bombarded by the energy released by the detonation of a primary fission bomb within, compressing the fuel material (tritium, deuterium or lithium deuteride) and causing a fusion reaction.  Some advanced designs use fast neutrons produced by this second stage to ignite a third fast fission or fusion stage.  The fission bomb and fusion fuel are placed near each other in a special radiation-reflecting container called a radiation case that is designed to contain x-rays for as long as possible.  The result is greatly increased explosive power when compared to single-stage fission weapons.  The device is colloquially referred to as a hydrogen bomb or, an H-bomb, because it employs the fusion of isotopes of hydrogen.

Raemer Schreiber: Raemer Edgar Schreiber (November 11, 1910 – December 24, 1998) was an American physicist from McMinnville, Oregon who served Los Alamos National Laboratory during World War II, participating in the development of the atomic bomb.  He saw the first one detonated in the Trinity nuclear test in July 1945, and prepared the Fat Man bomb that was used in the bombing of Nagasaki.  After the war, he served at Los Alamos as a group leader, and was involved in the design of the hydrogen bomb.  In 1955, he became the head of its Nuclear Rocket Propulsion (N) Division, which developed the first nuclear-powered rockets.  He served as deputy director of the laboratory from 1972 until his retirement in 1974.

Supporting paragraphs: Frederic de Hoffmann Edward Teller
Answer: Edward Teller