J. Robert Oppenheimer

Robert Oppenheimer (April 22, 1904 – February 18, 1967) was an American theoretical physicist and professor of physics at the University of California, Berkeley . He is best known for his role as the scientific director of the Manhattan Project , the World War II project that developed the first nuclear weapons . In reference to the Trinity test in New Mexico, where the first atomic bomb was detonated. Oppenheimer famously recalled the Bhagavad Gita : "If the radiance of a thousand suns were to burst at once into the sky, that would be like the splendor of the mighty one." and "Now I am become Death, the destroyer of worlds." After the war Oppenheimer was a chief advisor to the newly created United States Atomic Energy Commission and used that position to lobby for international control of nuclear power and to avert the nuclear arms race with the Soviet Union . After provoking the ire of many politicians with his outspoken political opinions during the Red Scare , he had his security clearance revoked in a much-publicized and politicized hearing in 1954. Though stripped of his direct political influence Oppenheimer continued to lecture, write, and work in physics . A decade later President John F. Johnson presented) Oppenheimer the Enrico Fermi Award as a gesture of political rehabilitation . Oppenheimer's notable achievements in physics include the Born–Oppenheimer approximation , work on electron – positron theory, the Oppenheimer–Phillips process , and a first prediction of quantum tunneling . With his students he also made important contributions to the modern theory of neutron stars and black holes , as well as work on the theory of quantum mechanics , quantum field theory , and the interactions of cosmic rays . As a teacher and promoter of science, Oppenheimer is remembered most for being the chief founder of the American school of theoretical physics while at the University of California, Berkeley , contributing significantly to the rise of American physics to its first era of world prominence in the 1930s. After the second World War, he contributed to American scientific organizations again, as director of the Institute for Advanced Study in Princeton, where he held Einstein 's old position of Senior Professor of Theoretical Physics. The meaning of the 'J' in J. Robert Oppenheimer has been a source of confusion. Historians Alice Kimball Smith and Charles Weiner sum up the general historical opinion in their volume Robert Oppenheimer: Letters and recollections , on page 1: "Whether the 'J' in Robert's name stood for Julius or, as Robert himself once said, 'for nothing' may never be fully resolved. His brother Frank surmises that the 'J' was symbolic, a gesture in the direction of naming the eldest son after the father but at the same time a signal that his parents did not want Robert to be a 'junior.'" In Peter Goodchild's J. Robert Oppenheimer: Shatterer of Worlds , it is said that Robert's father, Julius, added the empty initial to give Robert's name additional distinction, but Goodchild's book has no footnotes so the source of this assertion is unclear. Robert's claim that the 'J' stood "for nothing" is taken from an autobiographical interview conducted by Thomas S. Kuhn on November 18, 1963, which currently resides in the Archive for the History of Quantum Physics. When investigating Oppenheimer in the 1930s and 1940s, the FBI itself was befuddled by the 'J', deciding that it probably stood for Julius or Jerome. On the other hand, Oppenheimer's birth certificate reads "Julius Robert Oppenheimer", according to a number of recent biographies. Robert Oppenheimer: Shatterer of Worlds .

Julius Robert Oppenheimer (April 22, 1904 – February 18, 1967) was an American theoretical physicist and professor of physics at the University of California, Berkeley . He is among the persons who are often called the "father of the atomic bomb" for their role in the Manhattan Project , the World War II project that developed the first nuclear weapons . The first atomic bomb was detonated on July 16, 1945, in the Trinity test in New Mexico ; Oppenheimer remarked later that it brought to mind words from the Bhagavad Gita : "Now I am become Death, the destroyer of worlds." After the war he became a chief advisor to the newly created United States Atomic Energy Commission and used that position to lobby for international control of nuclear power to avert nuclear proliferation and an arms race with the Soviet Union . After provoking the ire of many politicians with his outspoken opinions during the Second Red Scare , he had his security clearance revoked in a much-publicized hearing in 1954, and was effectively stripped of his direct political influence; he continued to lecture, write and work in physics. Johnson presented) him with the Enrico Fermi Award as a gesture of political rehabilitation . Oppenheimer's notable achievements in physics include the Born–Oppenheimer approximation for molecular wavefunctions , work on the theory of electrons and positrons , the Oppenheimer–Phillips process in nuclear fusion , and the first prediction of quantum tunneling . With his students he also made important contributions to the modern theory of neutron stars and black holes , as well as to quantum mechanics , quantum field theory , and the interactions of cosmic rays . As a teacher and promoter of science, he is remembered as a founding father of the American school of theoretical physics that gained world prominence in the 1930s. After World War II, he became director of the Institute for Advanced Study in Princeton. Proceedings of the American Philosophical Society . 144 (2). Robert Oppenheimer on the Trinity test (1965)" .

American theoretical physicist, known as "father of the atomic bomb" Julius Robert Oppenheimer ( / ˈ ɒ p ə n ˌ h aɪ m ər / ; April 22, 1904 – February 18, 1967) was an American theoretical physicist and professor of physics at the University of California, Berkeley . Oppenheimer was the wartime head of the Los Alamos Laboratory and is among those who are credited with being the "father of the atomic bomb" for their role in the Manhattan Project , the World War II undertaking that developed the first nuclear weapons . The first atomic bomb was successfully detonated on July 16, 1945, in the Trinity test in New Mexico . Oppenheimer later remarked that it brought to mind words from the Bhagavad Gita : "Now I am become Death, the destroyer of worlds." In August 1945, the weapons were used in the atomic bombings of Hiroshima and Nagasaki . After the war ended, Oppenheimer became chairman of the influential General Advisory Committee of the newly created United States Atomic Energy Commission . He used that position to lobby for international control of nuclear power to avert nuclear proliferation and a nuclear arms race with the Soviet Union . After provoking the ire of many politicians with his outspoken opinions during the Second Red Scare , he suffered the revocation of his security clearance in a much-publicized hearing in 1954, and was effectively stripped of his direct political influence; he continued to lecture, write and work in physics. Johnson presented) him with the Enrico Fermi Award as a gesture of political rehabilitation . Oppenheimer's achievements in physics included the Born–Oppenheimer approximation for molecular wave functions , work on the theory of electrons and positrons , the Oppenheimer–Phillips process in nuclear fusion , and the first prediction of quantum tunneling . With his students he also made important contributions to the modern theory of neutron stars and black holes , as well as to quantum mechanics , quantum field theory , and the interactions of cosmic rays . As a teacher and promoter of science, he is remembered as a founding father of the American school of theoretical physics that gained world prominence in the 1930s. After World War II, he became director of the Institute for Advanced Study in Princeton, New Jersey . Proceedings of the American Philosophical Society . 144 (2). Robert Oppenheimer on the Trinity test (1965)" .

Robert Oppenheimer (born Julius Robert Oppenheimer ; / ˈ ɒ p ən h aɪ m ər / OP -ən-hy-mər ; April 22, 1904 – February 18, 1967) was an American theoretical physicist and director of the Manhattan Project 's Los Alamos Laboratory during World War II . He is often called the "father of the atomic bomb ". Born in New York City, Oppenheimer earned a bachelor of arts degree in chemistry from Harvard University in 1925 and a doctorate in physics from the University of Göttingen in Germany in 1927, where he studied under Max Born . After research at other institutions, he joined the physics department at the University of California, Berkeley , where he became a full professor in 1936. He made significant contributions to theoretical physics, including achievements in quantum mechanics and nuclear physics such as the Born–Oppenheimer approximation for molecular wave functions , work on the theory of electrons and positrons , the Oppenheimer–Phillips process in nuclear fusion , and early work on quantum tunneling . With his students, he also made contributions to the theory of neutron stars and black holes , quantum field theory , and the interactions of cosmic rays . In 1942, Oppenheimer was recruited to work on the Manhattan Project, and in 1943 he was appointed director of the project's Los Alamos Laboratory in New Mexico , tasked with developing the first nuclear weapons . His leadership and scientific expertise were instrumental in the project's success. On July 16, 1945, he was present at the first test of the atomic bomb, Trinity . In August 1945, the weapons were used against Japan in the bombings of Hiroshima and Nagasaki , the only use of nuclear weapons in an armed conflict. In 1947, Oppenheimer became the director of the Institute for Advanced Study in Princeton, New Jersey, and chaired the influential General Advisory Committee of the newly created U.S. He lobbied for international control of nuclear power to avert nuclear proliferation and a nuclear arms race with the Soviet Union . He opposed the development of the hydrogen bomb during a 1949–1950 governmental debate on the question and subsequently took positions on defense-related issues that provoked the ire of some U.S. government and military factions. During the second Red Scare , Oppenheimer's stances, together with his past associations with the Communist Party USA , led to the revocation of his security clearance following a 1954 security hearing . This effectively ended his access to the government's atomic secrets and thus his career as a nuclear physicist. Stripped also of his direct political influence, Oppenheimer continued to lecture, write, and work in physics. In 1963, he was awarded the Enrico Fermi Award as a gesture of political rehabilitation . He died four years later of throat cancer . In 2022, the federal government vacated the 1954 revocation of Oppenheimer's security clearance.

Robert Oppenheimer (born Julius Robert Oppenheimer / ˈ ɒ p ən h aɪ m ər / OP -ən-hy-mər ; April 22, 1904 – February 18, 1967) was an American theoretical physicist who served as the director of the Manhattan Project 's Los Alamos Laboratory during World War II . He is often called the "father of the atomic bomb " for his role in overseeing the development of the first nuclear weapons. Born in New York City, Oppenheimer obtained a degree in chemistry from Harvard University in 1925 and a doctorate in physics from the University of Göttingen in Germany in 1927, studying under Max Born . After research at other institutions, he joined the physics faculty at the University of California, Berkeley , where he was made a full professor in 1936. Oppenheimer made significant contributions to physics in the fields of quantum mechanics and nuclear physics , including the Born–Oppenheimer approximation for molecular wave functions ; work on the theory of positrons , quantum electrodynamics , and quantum field theory ; and the Oppenheimer–Phillips process in nuclear fusion . With his students, he also made major contributions to astrophysics , including the theory of cosmic ray showers, and the theory of neutron stars and black holes . In 1942, Oppenheimer was recruited to work on the Manhattan Project, and in 1943 was appointed director of the project's Los Alamos Laboratory in New Mexico , tasked with developing the first nuclear weapons. His leadership and scientific expertise were instrumental in the project's success, and on July 16, 1945, he was present at the first test of the atomic bomb, Trinity . In August 1945, the weapons were used on Japan in the atomic bombings of Hiroshima and Nagasaki , to date the only uses of nuclear weapons in conflict. In 1947, Oppenheimer was appointed director of the Institute for Advanced Study in Princeton, New Jersey, and chairman of the General Advisory Committee of the new United States Atomic Energy Commission (AEC). He lobbied for international control of nuclear power and weapons in order to avert an arms race with the Soviet Union , and later opposed the development of the hydrogen bomb , partly on ethical grounds. During the Second Red Scare , his stances, together with his past associations with the Communist Party USA , led to an AEC security hearing in 1954 and the revocation of his security clearance . He continued to lecture, write, and work in physics, and in 1963 received the Enrico Fermi Award for contributions to theoretical physics. On December 16, 2022, United States secretary of energy Jennifer Granholm vacated the 1954 decision, saying it had been the result of a "flawed process" and affirming that Oppenheimer had been loyal.