Szilard, Leo

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Leo Szilard was a nuclear physicist, biologist and advocate of global arms control. Aaron Novick is a biophysicist. From 1948 to 1952, they jointly investigated the genetics and physiology of bacteria and viruses at the Institute of Radiology and Physics (University of Chicago).

From the description of Research files, 1948-1969. (University of California, San Diego). WorldCat record id: 37952289

Gertrud Weiss studied medicine at the University of Vienna. After completing her medical degree in 1936 she moved to London, and later in 1938 to New York City where she worked in a hospital until 1950 when she moved to Denver to teach public health at the University of Colorado's Medical School. During this time, Szilard's and Weiss's relationship was conducted almost entirely through letters. Szilard and Weiss married in 1951, and in 1964 they moved to La Jolla California, where Szilard was offered a position at the Salk Institute. After her husband's death that same year, Gertrud Weiss Szilard collected and co-edited Szilard's papers, producing three volumes published by MIT Press.

From the description of Leo Szilard. Letters to Gertrud Weiss, 1937-1959. (University of California, San Diego). WorldCat record id: 64549574

Leo Szilard (1898-1964) participated in the American Manhattan Project but afterwards became a leading critic of the Cold War nuclear arms race.

From the description of Leo Szilard essay : typescript [copy], 1947 Mar. 7. (University of California, Berkeley). WorldCat record id: 122276093

Nuclear physicist, biophysicist, and advocate of global arms control. Born Leo Spitz in Budapest, Hungary. Obtained a Ph. D. in physics at the Univ. of Berlin. Collaborated with Albert Einstein on various patents. Moved to the United States in 1938 and made significant contributions to development of the atomic bomb as a member of the Manhattan Project.

Following World War II, Szilard turned to biophysics and also became a leading advocate of global cooperation and arms control. Was associated with many universities, including Oxford, Columbia, and Chicago. Married to Dr. Gertrud Weiss in 1951. Became a fellow of the Salk Institute for Biological Studies in 1963. Died on May 30, 1964.

From the description of Papers, 1898-1998. (University of California, San Diego). WorldCat record id: 19098188

Historical Background

Leo Szilard held a halftime appointment (1948-1952) as professor of biophysics at the Institute of Radiology and Biophysics, University of Chicago. Aaron Novick participated in the Manhattan Project at the University of Chicago (1943-1946) and later worked as an assistant professor of biophysics (1948-1955) at the Institute. Together they studied bacterial and viral populations under controlled physical and chemical conditions using a device called the chemostat. Novick was interested in the study of mutations and adaptive enzyme formation.

Between November 1949 and June 1950, Szilard arranged a series of meetings of researchers in the Midwest to present research on the genetics and physiology of bacteria and viruses. The participants included S. E. Luria, Joshua Lederberg, A. D. Hershey, S. Spiegelman, and James Watson. The meetings focused on pioneering research which formed the basis of early molecular biology.

In 1954 the Institute of Radiology and Biophysics was dissolved and a joint department of Biophysics and Biochemistry was established. During the reorganization process, Szilard took a leave of absence and accepted a visiting professorship at Brandeis University. Novick left for the Biological Laboratory at Cold Spring Harbor, and later he accepted a position at the Institute of Molecular Biology at the University of Oregon in Eugene. Novick and Szilard continued to correspond until Szilard's death in 1964.

From the guide to the Szilard / Novick Research Files, 1948 - 1969, (University of California, San Diego. Geisel Library. Mandeville Special Collections Library.)

Biography

Gertrud Weiss was born in Vienna, Austria, in 1909. She began studying medicine at the University of Vienna in the 1920s but quit within the first four months to pursue travels in Berlin, where she met Szilard. After several years in Berlin, Szilard convinced her to return to Vienna to pursue her degree in medicine, which Weiss completed in 1936. Compelled by the political climate and Szilard's urgings, Weiss moved to London and then, in 1938, to New York City. There she worked in a hospital until 1950 when she moved to Denver to teach public health at the University of Colorado's Medical School.

During this time, Szilard's and Weiss's relationship was conducted almost entirely through letters. Szilard was uninterested in marriage and it wasn't until 1951, when speculations on their relationship threatened Weiss's job, that they considered marriage. They married on October 13, 1951, and Weiss took Szilard's name, though they often lived separately during the years following.

In 1964, they moved together to La Jolla, California, where Szilard was offered a position at the Salk Institute. Szilard died that same year.

After her husband's death, Gertrud Weiss Szilard collected and co-edited Szilard's papers, producing three volumes published by MIT Press. Gertrud Weiss Szilard remained in California until her death in 1981.

From the guide to the Leo Szilard. Letters to Gertrud Weiss, 1937-1959, (Mandeville Special Collections Library)

Biography

Leo Szilard is best known for his pioneering work in nuclear physics, his participation in the Manhattan Project during World War II, and his opposition to the nuclear arms race in the postwar era.

The son of an engineer and the scion of an affluent Jewish family, Szilard was born Leo Spitz on February 11, 1898 in Budapest, Hungary. His family name was changed to Szilard in 1900. Szilard was a precocious child, and he took an interest in physics at the age of thirteen. He attended public school in Budapest before being drafted into the Austro-Hungarian army in 1917. In the army he was sent to officer's training school, but he was spared from active duty by a severe case of influenza. After the war he remained in Budapest but, due to political unrest and a lack of suitable educational opportunities, he left for Berlin in 1919.

In Berlin Szilard studied engineering at the Institute of Technology (Technische Hochschule), but his primary interest was physics. He was attracted to the work of great physicists like Albert Einstein, Max Planck, Max Von Laue, Erwin Schroedinger, Walter Nernst, and Fritz Haber -- most of whom were teaching in Berlin at that time.

In 1921 Szilard gave up his engineering studies and enrolled at the University of Berlin, where he studied physics under Max von Laue, among others. He earned his doctorate -- cum laude -- in August 1922 after submitting his dissertation entitled Uber die thermodynamischen Schwankungserscheinungen. In this work Szilard showed "that the Second Law of Thermodynamics covers not only the mean values, as was up to then believed, but also determines the general form of the law that governs the fluctuating values." The dissertation presented ideas relating to what would become the foundation of modern information theory.

Szilard began postdoctoral work at the Kaiser Wilhelm Institute in Berlin with Hermann Mark. Szilard's studies focused on the anomalous scattering of X-rays in crystals and the polarization of X-rays by reflection on crystals. Between 1925 and 1933, he applied for numerous patents, often with Albert Einstein. One of the Szilard-Einstein patents covered the invention of a new refrigeration system based on a method for pumping metals by a moving magnetic field. The two physicists hoped to interest the company A.E.G. (the German General Electric company) in producing a practical refrigerator based on their patent. Although this refrigerator was never produced, the refrigeration system was used effectively in the U.S in 1942 to develop an atomic reactor.

In 1933, With Hitler's rise to power in Germany, Szilard moved to England. In London he collaborated with T.A. Chalmers at St. Bartholomew's Hospital. There they developed the Szilard-Chalmers process, a technique to chemically separate radioactive elements from their stable isotopes. Much of Szilard's activity during this period related to his efforts to register his patents in England and to secure income with the help of the firm of Claremont, Haynes, and Company. Szilard's associates in various ventures included Isbert Adams, Arno Brasch, T.M. Vogelstein, R. Kammitzer, and Benjamin Liebowitz. Szilard also influenced Sir William Beveridge to found the Academic Assistance Council, an organization created to help persecuted scientists leave Nazi Germany. Between 1935 and 1937 he worked as a research physicist at the Clarendon Laboratory, Oxford University.

It was on a street corner in London, in October 1933, that Szilard first conceived of the possibility of a nuclear chain reaction. The possibility of such a chain-reaction -- the process essential for the releasing of atomic energy -- had been dismissed by the eminent physicist Lord Ernest Rutherford. Szilard successfully proved Rutherford wrong.

Szilard visited the United States several times in the mid-1930s, and he began to consider a move to America as the prospects for war in Europe increased. In 1938, at the time of the Munich pact, Szilard was a visiting lecturer in the United States. He decided to shift his residence to New York in anticipation of England's weakening policy toward Germany and the impending world war.

At the Pupin Laboratories at Columbia University, Szilard collaborated with Walter Zinn to research neutron emissions. They discovered that two fast neutrons are probably emitted in the fission process, and that the element uranium might sustain a chain reaction. Subsequent investigations with Enrico Fermi and Herbert Anderson, also at Columbia, demonstrated that a system composed of water and uranium oxide approached the requirements for a self-sustaining chain reaction. Szilard elaborated on a graphite uranium system in his manuscript entitled "Divergent Chain Reactions in a System Composed of Uranium and Carbon" (later expanded into the "A-55 Report" for the Metallurgical Laboratory in Chicago) which was submitted and accepted (although withheld) for publication in the Physical Review on February 16, 1940.

With the start of World War II, Szilard became intensely concerned about the applications of the new atomic theories to the development of weapons. Knowing that German nuclear research was at an advanced stage, he felt that the work being conducted by him and his colleagues should be withheld from publication. Szilard and his colleagues Eugene Wigner and Edward Teller hoped to gain the financial support of the United States Government in underwriting the cost of a definitive, large-scale experiment to prove that a sustained nuclear chain reaction was possible. Together they enlisted the assistance and influence of Albert Einstein. With Einstein's consent, Szilard drafted a letter, which was signed by Einstein and delivered to President Roosevelt by Alexander Sachs in October 1939. This letter outlined the possibility of the chain reaction and its implications for national defense.

Szilard's work on atomic energy intensified during World War II. With governmental support approved by President Roosevelt and with the assistance of the National Bureau of Standards, Szilard began to procure graphite and uranium through negotiations with suppliers like the National Carbon Company. These materials were necessary components for a large scale chain-reaction experiment. From February 1942 to July 1946, Szilard worked as "Chief Physicist" for Arthur H. Compton at the Metallurgical Laboratory of the University of Chicago. This Laboratory was one of the chief research centers for the development of the atomic bomb, in what would come to be called the Manhattan Project.

On December 2, 1942, Szilard and his colleagues demonstrated the first nuclear chain reaction. This demonstration took place in the graphite block reactor built under the grandstand at the University of Chicago's Stagg Field. This successful experiment was in part the result of Szilard's atomic theories.

Throughout the Manhattan project, Szilard was often frustrated by cumbersome government administration and security regulations. Like other scientists involved in the project, he felt uneasy about the dominant role played by the military in the project. Many of his memoranda from the period reflect these concerns.

Szilard viewed the production of the atomic bomb as a necessary counter-measure to the possibility of German nuclear development and deployment, but he foresaw the global consequences of the proliferation of this weapon. After Germany surrendered, Szilard organized his colleagues to press for limitations in the use of the atomic bomb. He drafted a letter to President Roosevelt urging restraint in the use of the bomb, but the President died before the letter could be delivered. In the spring of 1945, Szilard influenced a group of scientists to produce the Franck Report, which outlined the dangers of a nuclear arms race. The report advised against the use of an atomic bomb against Japanese civilians, advocating instead a non-combat demonstration.

In July 1945 Szilard circulated a petition urging President Truman not to drop the atomic bomb on Hiroshima. A revised version of this petition was eventually signed by 68 scientists at the Metallurgical Laboratory. It was strongly opposed by General Groves, head of the Manhattan Project, on the grounds that such a petition would breach security and expose the existence of the atomic bomb. The petition did not reach the president. After Japan's surrender Szilard worked to defeat the May-Johnson bill, which sought to place atomic energy in the hands of the military.

After the war Szilard began to focus on biology, a field he had long been interested in. He resigned from the Metallurgical Laboratory on June 1, 1946, and became a half-time professor of biophysics at the Institute of Radiobiology and Biophysics at the University of Chicago. He also worked half-time for the University's Division of Social Sciences as Adviser to the Office of Inquiry into the Social Aspects of Atomic Energy. For the academic year 1953-1954, Szilard served as a visiting professor of biophysics at Brandeis University. In 1956, he became a professor of biophysics at the Enrico Fermi Institute for Nuclear Studies at the University of Chicago. To broaden his knowledge of biology he often attended seminars and conferences, such as the Cold Springs Harbor Symposium in New York.

Throughout the 1950s Szilard continued his biological research. In Chicago he collaborated with Aaron Novick to develop the "chemostat," a device for "maintaining a multiplying population of bacteria under conditions not changing in time." Numerous articles resulted from his research, including "Experiments with the chemostat on spontaneous mutation of bacteria," "Anti-mutagens," and "On the nature of the aging process." Szilard's theory of aging, a major outgrowth of his research, became a continuing interest in his later life. Much of Szilard's research funding came from contracts and grants with organizations such as the National Advisory Health Council and the Office of Naval Research. He also worked as a consultant to private industry, and his patents for a "liquid-liquid extractor" were used by Podbielniak, Inc.

Szilard became increasingly active in public political activities during the Postwar period. In his lectures he advocated nuclear arms control, world government, and an elite leadership role for the international scientific community. Many of his ideas were inspired by the works of H.G. Wells, which he had read avidly as a young man. Wells's book The World Set Free (London, 1914), which had predicted the development of atomic power, had made a great impression on Szilard when he read it in 1932.

In 1947, Szilard published a "letter to Stalin" in the Bulletin of the Atomic Scientists. In the letter he urged world leaders to openly exchange ideas in an effort to mitigate the growing Cold War. In his appeal he took a balanced view of the peace process, blaming neither the U.S. or the Soviet Union for the situation. In the late 1950s Szilard's ideas inspired Albert Einstein and Bertrand Russell to organize an international conferences of concerned scientists. The first conference took place at Pugwash, Nova Scotia in 1957, and subsequent conferences, named after the location of the first meeting, have been held throughout the world since then.

After 1958, with the increasing threat of nuclear war, Szilard's political activities intensified. Between October 1959 and October 1960 he carried on a series of interactions with Soviet Premier Nikita Khruschev which culminated in a two hour interview in New York. Szilard proposed the development of a Moscow-Washington "hot line," which could facilitate communications between super-power leaders in the interest of global peace. With the election of President Kennedy, Szilard moved to Washington, D.C., taking up residence at the DuPont Plaza Hotel. He criticized Kennedy's handling of the Bay of Pigs debacle and the President's bomb shelter program. Szilard offered to personally intercede with Khruschev during the Berlin Crisis in 1961.

Throughout the early 1960s Szilard continued his advocacy of global cooperation. In 1961 he began a lecture tour which would take him to eight college campuses. His first lecture, at the Harvard Law School Forum on November 17, 1961, was entitled "Are We on the Road to War?" From these and other efforts came an organization known as the Council for a Livable World, a political action committee which encouraged members to donate two percent of their income to designated political candidates. In 1962, Szilard attempted unsuccessfully to organize informal meetings between lesser officials of both the United States and the Soviet Union in what he termed the "Angels Project."

Szilard wrote extensively during this period. He suggested rules for nuclear age living in "How to Live with the Bomb and Survive" (1960). He wrote a futuristic work of fiction entitled The Voice of the Dolphins (1961). In this work Szilard had the dolphins describe the debacle of human society, out of which they have inherited the earth. He carried on his writing during two courses of radiation treatments for bladder cancer in 1960 and 1962. While undergoing these treatments in New York City's Memorial Hospital, Szilard also made an extensive series of tape recordings relating to his life and his involvement in the Manhattan project.

In July 1963, Szilard was appointed as a non-resident fellow at the Salk Institute for Biological Studies in La Jolla, California. He had known Jonas Salk since the late 1950s, and many of Szilard's ideas had influenced Salk in the planning of the Institute. Szilard moved to La Jolla in February 1964. There he intended to work in biophysics as a Resident Fellow of the Salk Institute. But three months later, on May 30, 1964, he died of a heart attack.

Szilard lived a peripatetic life. After leaving Budapest in 1919 he had no true permanent residence. He stayed mostly in hotels, and his associations with various universities were usually tenuous. Because he had no long-term institutional affiliations, Szilard had difficulty in marshalling the material forces -- such as a clerical and laboratory staff -- needed to follow through on many of his important ideas. Szilard was essentially a thinker, and he preferred to leave for others the tasks involved in implementing his ideas.

Szilard's life gained some stability through his relationship with Dr. Gertrude Weiss. Weiss was a physician who had fled Nazi Germany in 1930s. She met Szilard before the war, and the two were married in the United States in 1951. Still, the couple often lived apart, and Szilard considered himself a "bachelor at heart."

For more detailed biographical information, see LEO SZILARD: HIS VERSION OF THE FACTS, edited by Spencer Weart and Gertrude Weiss Szilard (Cambridge, Mass.: MIT Press, c1978) and the "Introduction" by Barton Bernstein to Helen Hawkins, et. al., eds., TOWARD A LIVABLE WORLD: LEO SZILARD AND THE CRUSADE FOR NUCLEAR ARMS CONTROL (Cambridge, Mass.: MIT Press, c. 1987), p. xvii-lxxiv. Finally, a full-length biography of Szilard by William Lanouette has been published entitled GENIUS IN THE SHADOWS: A BIOGRAPHY OF LEO SZILARD, THE MAN BEHIND THE BOMB.

From the guide to the Leo Szilard Papers, 1898-1998, (University of California, San Diego. Geisel Library. Mandeville Special Collections Library.)

Archival Resources
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creatorOf Szilard, Leo. Papers, 1898-1998. University of California, San Diego, UC San Diego Library; UCSD Library
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correspondedWith Mayer, Joseph Edward, 1904- person
associatedWith McLennan, J. C., (John Cunningham), 1867-1935 person
associatedWith Meitner, Lise, 1878-1968 person
associatedWith Mie, Gustav, 1868-1957 person
associatedWith Millikan, Robert Andrews, 1868-1953 person
associatedWith Morrison, Philip. person
associatedWith Morse, Philip McCord, 1903-1985 person
associatedWith Muller, H. J. (Hermann Joseph), 1890-1967. person
associatedWith Mulliken, Robert Sanderson, 1896-1986 person
correspondedWith Nation (New York, N.Y. : 1865). corporateBody
associatedWith Nef, John U. (John Ulric), 1899-1988. person
associatedWith New York Times Company corporateBody
associatedWith Niels Bohr Library. corporateBody
associatedWith Nishina, Yoshio, 1890-1951 person
associatedWith Novick, Aaron person
correspondedWith Oppenheimer, J. Robert, 1904-1967. person
associatedWith Paschen, F., (Friedrich), 1865-1947 person
associatedWith Pauling, Linus, 1901-1994, person
associatedWith Pauli, Wolfgang, 1900-1958 person
associatedWith Planck, Max, 1858-1947 person
associatedWith Polanyi, Michael, 1891-1976 person
associatedWith Polyani, Michael, 1891- person
correspondedWith Provine, William B. person
correspondedWith Rabi, I. I. (Isador Isaac), 1898- person
correspondedWith Rabi, I. I. (Isidor Isaac), 1898-1988. person
associatedWith Rabinowitch, Eugene, 1901-1973. person
associatedWith Rosenfeld, L., (Leon), 1904-1974 person
associatedWith Rosseland, Svein, 1894-1985 person
associatedWith Rubens, Heinrich, 1865-1922 person
associatedWith Runge, Carl, 1856-1927 person
associatedWith Rutherford, Ernest, 1871-1937 person
associatedWith Sakharov, Andreĭ, 1921-1989 person
associatedWith Salk, Jonas, 1914-1995. person
associatedWith Scheel, Karl, 1866-1936 person
associatedWith Schrödinger, Erwin, 1887-1961 person
associatedWith Smyth, Henry De Wolf, 1898-1986. person
associatedWith Sommerfeld, Arnold, 1868-1951 person
associatedWith Stanford University. Press. corporateBody
associatedWith Stark, Johannes, 1874-1957 person
associatedWith Suess, Hans Eduard, 1909- person
associatedWith Szilard, Gertrud Weiss person
associatedWith Szilard, Gertrud Weiss person
correspondedWith Teller, Edward, 1908- person
associatedWith Teller, Edward, 1908-2003, person
associatedWith Thomson, J. J., Sir, (Joseph John), 1856-1940 person
associatedWith Uhlenbeck, George Eugène, 1900-1988 person
associatedWith University of Chicago. corporateBody
associatedWith University of Chicago. Institute of Radiology and Biophysics. corporateBody
associatedWith Urey, Harold Clayton, 1893-1981. person
associatedWith Van Vleck, J. H., (John Hasbrouck), 1899-1980 person
associatedWith Voigt, Woldemar, 1850-1919 person
associatedWith Von Neumann, John, 1903-1957 person
associatedWith Wallace, Mike, 1918- person
associatedWith Warburg, Emil Gabriel, 1846-1931 person
associatedWith Weiss, Egon, person
associatedWith Weisskopf, Victor Frederick, 1908-2002. person
associatedWith Weizsäcker, Carl Friedrich, Freiherr von, 1912-2007. person
associatedWith Wigner, Eugene Paul, 1902-1995, person
associatedWith Wilson, Robert R., 1914-2000. person
associatedWith Zeeman, Pieter, 1865-1943 person
Place Name Admin Code Country
Soviet Union
United States
United States
Subject
Bacteria--Reproduction
Scientific apparatus and instruments
Atomic bomb--United States
Nuclear disarmament
Nuclear arms control
Atomic bomb
Viral genetics
Chemostat
Viruses--Morphology
Bacteria--Research--History
Nuclear physics
Viruses--Research--History
Bacteria
Nuclear nonproliferation
Microbiology--Instruments
Viruses--Physiology
Chess--Tournaments
Science--Social aspects
Viruses--Reproduction
Bacteria--Physiology
Bacterial genetics
Biochemistry--Instruments
Viruses
Bacteria--Morphology
Nuclear physicists
Occupation
Physicists--Interviews
Function

Person

Birth 1898-02-11

Death 1964-05-30

Americans

English,

German

Information

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Ark ID: w6dn46tv

SNAC ID: 45007164