California Institute of Technology

• 1. Introduction

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  The California Institute of Technology, known as Caltech, sits on 124 acres in Pasadena, California, about 11 miles northeast of downtown Los Angeles. It is a place where the density of genius per square foot is almost impossible to grasp. Eighty Nobel laureates have been affiliated with it. That number makes Caltech the institution with the highest number of Nobelists per capita in America. One person alone, chemist Linus Pauling, won two unshared Nobel Prizes, a feat no one else has ever achieved. Yet the school began not as a crucible of the scientific elite but as a vocational and preparatory school, founded in 1891 by a local businessman on a corner of Old Pasadena. How does a trade school transform into one of the most consequential research universities on Earth? That question pulls you through every chapter of Caltech's story.

• 2. The Founding Vision

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  On the 23rd of September 1891, Amos G. Throop opened a modest school on Fair Oaks Avenue and Chestnut Street in what is now Old Pasadena. Throop was a local businessman and politician, not a scientist, and his school cycled through names, from Throop University to Throop Polytechnic Institute to Throop College of Technology, before settling on the California Institute of Technology in 1920.

  The pivot from vocational school to research university owed almost everything to George Ellery Hale, a solar astronomer from the University of Chicago who had founded the Mount Wilson Observatory in 1904. Hale joined Throop's board of trustees in 1907 and saw in the struggling school a vehicle for something much larger. He wanted to build a national center of science in Southern California. His first move was administrative: he engineered the appointment of James A. B. Scherer, a literary scholar skilled in fund-raising, as Throop's president in 1908. Scherer quickly persuaded retired businessman Charles W. Gates to donate $25,000 in seed money, which paid for Gates Laboratory, the first dedicated science building on campus.

  Hale then recruited aggressively. Physical chemist Arthur Amos Noyes came from MIT to develop the institution as a center for science and technology. Robert Andrews Millikan, an experimental physicist at the University of Chicago, was drawn in through the establishment of the Norman Bridge Laboratory in 1917. Millikan would go on to win the Nobel Prize in Physics in 1923, the first of many such recognitions the school would accumulate.

• 3. War, Weapons, and Rocketry

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  Theodore Roosevelt visited the Throop Institute on the 21st of March 1911, and delivered a speech calling for institutions like it to produce engineers who could build things like the Panama Canal, along with a rare few capable of producing scientists of the caliber of George Ellery Hale himself. Roosevelt could not have known how literally his vision would be realized in the decades ahead.

  During World War I, Hale organized the National Research Council to coordinate scientific work on military problems, and he used the council to channel resources toward Throop. During World War II, Caltech's involvement deepened to a degree that few universities matched. Scientists including J. Robert Oppenheimer, Richard Tolman, and Robert Bacher worked on the Manhattan Project. Charles Lauritsen led a group at Caltech that developed the high-explosive lenses used in the Fat Man implosion bomb, which was central to the Trinity Test and the bombing of Nagasaki. The Salt Wells Pilot Plant at Inyokern, developed with Caltech scientists, began producing high explosives just days before the Trinity Test in July 1945.

  Caltech researchers also developed rockets with names like "Tiny Tim" and "Mighty Mouse", used in naval engagements and land assaults. The 5-inch High-Velocity Aircraft Rocket, nicknamed the "Holy Moses", was deployed against enemy fortifications and ships. By the end of the war, Caltech had grown so intertwined with the Navy's Bureau of Ordnance that the institution had essentially become an extension of it.

  From April to December 1951, Caltech hosted Project Vista, a classified federal study named after the Vista del Arroyo Hotel where the work took place. Triggered by the Korean War and Soviet pressure, the project studied new ways to coordinate tactical air support with ground troops. The Army, Air Force, and Navy all sponsored it. In exchange for Caltech's participation, the university received about $750,000. William A. Fowler, a Caltech professor, served as research director, and more than a fourth of the faculty staffed the project.

• 4. The Jet Propulsion Laboratory

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  Theodore von Kármán arrived at Caltech in the late 1920s after the graduate school of aeronautics was established in 1926. His influence on American rocketry would be profound and lasting. The antecedents of what became the Jet Propulsion Laboratory were established between 1936 and 1943 under his direction.

  Participants in von Kármán's GALCIT project included Frank Malina, who helped develop the WAC Corporal, the first American rocket to reach the edge of space; Jack Parsons, a pioneer in liquid and solid rocket fuels who designed the first castable composite-based rocket motor; and Qian Xuesen, later dubbed the "Father of Chinese Rocketry".

  JPL today is a federally funded research and development center owned by NASA and operated by Caltech under a formal contract. In 2008, JPL spent over $1.6 billion on research and development and employed over 5,000 people. The JPL Director also serves as a Caltech Vice President, an arrangement that keeps the laboratory tightly bound to the university's academic structure. The JPL relationship is, in financial and symbolic terms, among the most consequential institutional partnerships in American science.

• 5. Nobel Laureates and Intellectual Life

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  Robert Andrews Millikan served as Caltech's effective president, with the title "Chairman of the Executive Council", from 1921 to 1945. His influence was pervasive enough that the school was sometimes called "Millikan's School". He launched a visiting-scholars program that drew Paul Dirac, Erwin Schrödinger, Werner Heisenberg, Hendrik Lorentz, and Niels Bohr to the campus. Albert Einstein arrived in 1931 to refine his Theory of General Relativity, then returned as a visiting professor in 1932 and 1933.

  From the 1950s to the 1980s, Caltech was home to Murray Gell-Mann and Richard Feynman, whose work was central to establishing the Standard Model of particle physics. Gell-Mann introduced a classification of hadrons and postulated the existence of quarks. Feynman was celebrated beyond the physics community as an exceptional teacher and an unconventional public figure, publishing the Feynman Lectures on Physics along with popular texts such as Six Easy Pieces.

  Linus Pauling pioneered quantum chemistry and molecular biology, discovering the nature of the chemical bond in 1939. Charles Richter, also a Caltech alumnus, developed the earthquake magnitude scale that carries his name. Clair Patterson was the first to accurately determine the age of the Earth by measuring lead-to-uranium ratios in meteorites. More recently, Caltech physicists Kip Thorne and Barry Barish, along with MIT physicist Rainer Weiss, were awarded the 2017 Nobel Prize in Physics for their roles in building the LIGO observatory and detecting gravitational waves directly for the first time on the 14th of September 2015.

• 6. Student Culture and Pranks

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  Caltech's honor code states simply that no member of the community shall take unfair advantage of any other member. That single sentence governs academic life, allows professors to assign take-home examinations, and creates an atmosphere of institutional trust that coexists, somewhat improbably, with a long tradition of elaborate mischief.

  The most celebrated prank in Caltech history unfolded during the 1961 Rose Bowl Game, when students altered the flip-cards held up by stadium attendees to display "Caltech" and several unintended messages. The episode is now called the Great Rose Bowl Hoax. At the 1984 Rose Bowl, students changed the scoreboard to read Caltech 38, MIT 9. At some point the Hollywood Sign itself was made to read "Caltech" by covering parts of specific letters.

  The rivalry with MIT generated its own extended campaign. In 2005, Caltech students visited MIT's Campus Preview Weekend and covered the word "Massachusetts" in the building facade inscription, leaving it to read "That Other Institute of Technology." MIT responded the following year by sending students posing as movers to steal the 130-year-old, 1.7-ton Fleming House cannon and transport it more than 3,000 miles to Cambridge. Thirty members of Fleming House traveled to MIT and reclaimed the cannon on the 10th of April 2006.

  On campus, annual traditions include Ditch Day, when seniors abandon campus after leaving elaborately designed mechanical, electrical, and software obstacles for underclassmen to solve. Every morning during finals week, Wagner's "Ride of the Valkyries" is played at 7:00 a.m. at maximum volume. Playing it at any other time, unless one happens to be listening to the full fourteen hours and five minutes of The Ring Cycle, results in being dragged into the showers fully dressed.

• 7. Alumni Who Shaped the World

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  Arnold Beckman received his PhD in 1928 and invented the pH meter, then commercialized it by founding Beckman Instruments. His success provided seed funding for William Shockley, who had co-invented the semiconductor transistor and enrolled as an undergraduate in 1932. Shockley established his laboratory in Mountain View, California, near his aging mother in Palo Alto. His decision to use silicon rather than germanium as the semiconductor material, combined with the resulting concentration of companies in that geographic corridor, gave rise to the term "Silicon Valley".

  Shockley's aggressive management style eventually became unbearable, and in late 1957 eight of his researchers resigned to form Fairchild Semiconductor. Among the "traitorous eight" was Gordon E. Moore, who earned his PhD in 1954 and later left Fairchild to co-found Intel. National Semiconductor and Advanced Micro Devices also descended from Fairchild, spawning further companies in the region.

  Other alumni shaped the cosmos as directly as they shaped commerce. Astronomer Eugene Merle Shoemaker co-discovered Comet Shoemaker-Levy 9, which crashed into Jupiter, and became the first person whose ashes were crashed into the Moon. Astronaut Harrison Schmitt, who earned his undergraduate degree in 1957, was the only geologist ever to walk on the lunar surface and later served as a United States Senator. Donald Knuth, who received his PhD in 1963, created the TeX typesetting system and wrote The Art of Computer Programming, earning the title "father" of the analysis of algorithms. The Turing Award, described as the Nobel Prize of Computer Science, has gone to six Caltech alumni.

• 8. Research and Reinvention

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  During Lee A. DuBridge's presidency, which ran from 1946 to 1969, Caltech's faculty doubled and the campus tripled in size. DuBridge welcomed federal funding in ways his predecessors had not, and new fields including chemical biology, planetary science, nuclear astrophysics, and geochemistry took root. A 200-inch telescope was dedicated on Palomar Mountain in 1948 and remained the world's most powerful optical telescope for over forty years.

  In 2019, the Resnick family of The Wonderful Company gave Caltech a gift of $750 million for sustainability research, the largest donation ever made for environmental sustainability research and the second-largest private donation to an American academic institution, behind a gift of $1.8 billion to Johns Hopkins University from Bloomberg in 2018. In 2010, Caltech partnered with Lawrence Berkeley National Laboratory to establish the Joint Center for Artificial Photosynthesis, which was set to receive up to $122 million in federal funding over five years to develop methods for generating fuels directly from sunlight.

  In January 2021, the Board of Trustees authorized the removal of names from six campus buildings linked to the Human Betterment Foundation, a eugenics organization. Millikan Library was renamed Caltech Hall, and Ruddock House became Grant D. Venerable House, named after Caltech's first Black graduate. The same year, graduate students and postdoctoral researchers began organizing, and by February 2024, the National Labor Relations Board certified that 78 percent of eligible voters had voted in favor of unionization. By December 2024-86 percent of those participating in a strike authorization vote approved authorizing the bargaining team to call a strike if necessary. Ray Jayawardhana, an astrophysicist, is set to become Caltech's tenth president beginning the 1st of July 2026.