Frank Oppenheimer

Frank Friedman Oppenheimer (August 14, 1912 – February 3, 1985) was an American physicist who worked on the Manhattan Project, was a target of McCarthyism, and was later the founder of the Exploratorium in San Francisco. He was the younger brother of Robert Oppenheimer, the first director of Los Alamos National Laboratory.

Growing up eight years Robert's junior, Frank was constantly in the shadow of his brilliant brother. At one point considering to be professional flutist, Frank eventually followed his brother's encouragements and became a physicist as well. After graduating from Johns Hopkins University in 1933, he studied for a year and a half at the Cavendish Laboratory in Cambridge, England. In 1935, he worked on the development of nuclear particle counters at the Institute di Arcetri in Florence, Italy.

While completing his Ph.D. work at the California Institute of Technology, Oppenheimer became engaged to Jaquenette Quann, an economics student at the University of California, Berkeley who was active in the Youth Communist League. Robert recommended against it, but despite this in 1936 Frank and Jackie were married, and soon had both joined the American Communist Party — also against Robert's recommendations.

During World War II, Robert became scientific director of the Manhattan Project, the Allied effort to produce the first atomic weapons. From 1941 to 1945 Frank worked at the University of California Radiation Laboratory on the problem of uranium isotope separation under the direction of his brother's good friend, Ernest O. Lawrence. In 1945 he was sent to the enrichment facility at Oak Ridge, Tennessee to help monitor the equipment, and then later in the year arrived at the secret Los Alamos laboratory which his brother was running. There he assisted in supervising security at the first weapons test at the Trinity site.

After the war, Frank returned to Berkeley, working with Luis Alvarez and Wolfgang Panofsky to develop the proton linear accelerator. In 1947 he took a position as Assistant Professor of Physics at the University of Minnesota.

As part of a large investigation on the possible mishandling of "atomic secrets" during the war, Frank was called before the United States Congress House Un-American Activities Committee (HUAC). Before the Committee, Frank testified that he had been a member of the Communist Party, but refused to name others he knew to be members. This caused a media sensation — that Robert Oppenheimer's brother was an admitted Communist — and led to Frank's immediate dismissal from his post at the University of Minnesota.

After being branded a Communist, Frank could no longer find work in physics. He would later learn that the FBI would send threatening letters institutions after he had submitted employment applications. Furthermore, he was denied a passport by the U.S. government, so traveling abroad to work was out of the question as well. Frank and Jackie eventually sold one of the Van Gogh paintings he had inherited from his father, and with the money bought land in Pagosa Springs, Colorado, and started life over again as a cattle farmer.

In 1957, the Red Scare had lessened to the point that Frank was allowed to teach science at a local high school. In two years, he was offered a position at the University of Colorado teaching physics, and it was there that Frank began to take an interest in developing improvements in science education. He was eventually awarded a grant from the National Science Foundation to develop new pedagogical methods, which resulted in a "Library of Experiments" — nearly one hundred models of classical laboratory experiments which could be used in aiding the teaching of physics to elementary school children.

In 1965, Frank was awarded a Guggenheim Fellowship to study the history of physics and conduct bubble chamber research at University College, London, where he was exposed to European science museums for the first time. Inspired, Frank devoted the next years of his life to creating a similar resource in the United States.

Four years later, the Exploratorium opened its doors for the first time — an interactive museum of art, science, and human perception based on the philosophy that science should be fun and accessible for people of all ages, set next to the stately Palace of Fine Arts of San Francisco. Until his death at his home in Sausalito, California on February 3, 1985, Frank Oppenheimer served as director to the museum and was personally involved in almost every aspect of its operations.

External links

• Caltech oral history interview (http://oralhistories.library.caltech.edu/archive/00000069/01/OH_Oppenheimer.pdf)
• Frank Oppenheimer site at the Exploratorium (http://www.exploratorium.edu/frank/index.html)