University of California, Berkeley
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UC Berkeley is the public research university most responsible for the open-source infrastructure that runs modern AI: its systems labs created Apache Spark, Ray, and vLLM, and its Berkeley Artificial Intelligence Research Lab (BAIR) is one of the largest academic AI groups in the world, with more than 50 faculty and over 300 graduate students and postdocs.[6][28] It is also the training ground for many of the people now leading frontier AI labs, including OpenAI co-founder John Schulman, Perplexity AI CEO Aravind Srinivas, and RLHF pioneer Paul Christiano.[24][25]
The University of California, Berkeley (commonly called UC Berkeley, Berkeley, or Cal) is a public land-grant research university in Berkeley, California. Chartered on March 23, 1868, it is the founding campus of the University of California system.[3] Berkeley is one of the world's leading universities for artificial intelligence and machine learning research, home to the Berkeley Artificial Intelligence Research Lab (BAIR) and a long lineage of systems labs (AMPLab, RISELab, Sky Computing Lab) that produced Apache Spark, Ray, vLLM, and the companies Databricks, Anyscale, and Covariant.[6][9] The campus has been associated with 63 Nobel laureates and counts among its faculty and alumni many of the people who shaped modern AI, including Stuart Russell, Michael I. Jordan, Pieter Abbeel, Sergey Levine, and OpenAI co-founder John Schulman.[1][16]
| Field | Detail |
|---|---|
| Founded | March 23, 1868 (Charter Day) |
| Type | Public land-grant research university |
| Parent system | University of California |
| Chancellor | Rich Lyons (since July 1, 2024) |
| Total enrollment (Fall 2024) | 45,882 |
| Undergraduate | 33,070 |
| Graduate / professional | 12,812 |
| Academic staff | About 1,789 full-time and 886 part-time faculty |
| Endowment | $9.37 billion (2025) |
| Motto | Fiat Lux ("Let there be light") |
| Location | Berkeley, California, United States |
| Athletics | NCAA Division I, Atlantic Coast Conference; 30 varsity sports as the California Golden Bears |
| Mascot | Oski the Bear |
| Colors | Berkeley Blue and California Gold |
| Website | berkeley.edu |
The university traces its legal origin to the Organic Act, signed on March 23, 1868 by Governor Henry Haight. The act merged the private College of California (founded in Oakland in 1855) with the state's land-grant Agricultural, Mining, and Mechanical Arts College, the latter created to use the federal land grant authorized by the Morrill Act that President Abraham Lincoln signed in 1862. Classes began in Oakland in September 1869 with 10 faculty and roughly 40 students. In 1873 the campus moved to its permanent home north of Oakland, in a town the trustees had named Berkeley after the Anglo-Irish philosopher George Berkeley.[3]
For most of its first 80 years there was no separate "Berkeley" campus. Berkeley was the University of California, with a single president serving as both system head and campus chief executive. The university began establishing other campuses over the following decades (UCLA in 1919, UC Santa Barbara in 1944, and others), and in 1952 the Regents formally reorganized the system into semi-autonomous campuses, each with its own chancellor. Clark Kerr became Berkeley's first chancellor under that structure, while Robert Sproul remained UC system president.[3]
In the fall of 1964 Berkeley students organized the Free Speech Movement (FSM) after the administration tried to ban political tabling on campus.[20] The most famous moment came on October 1, when graduate student Jack Weinberg was arrested for setting up a Congress of Racial Equality table; students surrounded the police car for more than 30 hours.[20] Mario Savio, a philosophy major who had spent the summer registering Black voters in Mississippi, climbed on top of the car and gave a speech that turned him into the face of the movement. On December 2, Savio delivered his "Bodies upon the gears" speech to a crowd of about 4,000 in front of Sproul Hall.[20] The FSM is widely credited as the start of the 1960s student protest era and changed how American universities handled political speech.[20]
The second half of the 20th century turned Berkeley into a research powerhouse, in close partnership with Lawrence Berkeley National Laboratory just up the hill. Berkeley faculty and alumni helped invent the cyclotron, identified 16 chemical elements (more than any other institution), built the foundations of microeconomics and game theory at Cal, and produced the first transistor radio.[3] By the early 2000s the campus had also become one of the most important sites in the world for computer systems and AI research, a role detailed in the sections below.
In April 2024 the UC Regents named Rich Lyons, a Berkeley alum and longtime dean of the Haas School of Business, as the university's 12th chancellor.[4] He took office on July 1, 2024, becoming the first Berkeley undergraduate alum ever to hold the job.[4]
Berkeley offers about 400 degree programs across 15 schools and colleges.[5] The College of Letters and Science is by far the largest unit and houses most of the humanities, social sciences, and basic natural sciences. Engineering, Chemistry, and the newer College of Computing, Data Science, and Society sit alongside professional schools in business, law, public health, public policy, education, journalism, social welfare, optometry, and information.[5]
| School or college | Year established | Notes |
|---|---|---|
| College of Letters and Science | 1915 | More than 60 departments; Berkeley's largest college |
| College of Engineering | 1931 | Houses EECS, Mechanical, Civil, Bioengineering, IEOR, Materials Science, Nuclear |
| College of Chemistry | 1872 | One of the oldest and most decorated chemistry programs in the country |
| College of Computing, Data Science, and Society (CDSS) | 2019 | Joint home of EECS, Statistics, the Berkeley Institute for Data Science, and the data science major |
| College of Environmental Design | 1959 | Architecture, Landscape Architecture, City and Regional Planning |
| Rausser College of Natural Resources | 1974 (renamed 2020) | Agricultural and resource economics, ESPM, plant and microbial biology |
| Haas School of Business | 1898 | Oldest public business school in the U.S. |
| Berkeley Law (formerly Boalt Hall) | 1894 | Top-ranked U.S. law school |
| School of Public Health | 1943 | Master's and doctoral programs across public health disciplines |
| Goldman School of Public Policy | 1969 | Master's, doctoral, and undergraduate minor in public policy |
| Berkeley School of Education | 1892 | Teacher prep, Ed.D., Ph.D., and a minor |
| School of Information | 1994 | Home of the I School and the Master of Information and Data Science (MIDS) |
| Graduate School of Journalism | 1957 | Two-year M.J. program |
| School of Optometry | 1923 | Professional O.D. and vision science research |
| School of Social Welfare | 1944 | M.S.W. and Ph.D. programs |
The student-to-faculty ratio is roughly 19 to 1, and 71% of undergraduate classes have fewer than 30 students. About 26% of first-year undergraduates are first-generation college students, 21% are transfer admits (Berkeley remains a major destination for California community college transfers), and 29% receive Pell Grants.[2]
Berkeley is consistently in the top tier of American research universities by funded research expenditure. The campus's sponsored research budget passed $1 billion for the first time in fiscal year 2020-21, with roughly half of that money historically coming from federal agencies (NIH, NSF, DOE, DARPA, DOD).[1] Over the prior decade research funding averaged about $740 million per year. The library system holds more than 14.6 million volumes across 20-plus libraries, making it one of the largest academic library systems in North America.[1]
Berkeley also manages, on behalf of the U.S. Department of Energy, the Lawrence Berkeley National Laboratory (LBNL or Berkeley Lab), located on a hillside immediately above the campus.[16] Berkeley Lab was founded in 1931 by Ernest O. Lawrence as the Radiation Laboratory and has been UC-managed since 1943.[16] The Berkeley campus and Berkeley Lab share more than 200 joint faculty appointments and have together produced 16 Nobel Prizes.[16] The DOE renewed UC's management contract through June 1, 2030.[16] Berkeley also hosts or co-hosts other DOE Bioenergy Research Centers (such as the Joint BioEnergy Institute, JBEI) and is a major partner in DOE-funded supercomputing through the National Energy Research Scientific Computing Center (NERSC), which is operated by Berkeley Lab.
Berkeley has been central to AI research for more than four decades. The EECS department graduated AI textbook coauthor Stuart Russell into its faculty in 1986, hired probabilistic-ML pioneer Michael I. Jordan in 1998, and through the 2010s built the largest concentration of deep learning, robotics, and systems-for-ML researchers on the West Coast.[23] Its distinctive contribution has been at the intersection of AI and systems: the open-source software that the rest of the industry uses to train and serve large models, including Apache Spark, Ray, and vLLM, all originated in Berkeley labs.[17][24][28] Many of the people now leading frontier AI labs in San Francisco trained at Berkeley.
The Berkeley AI Research (BAIR) Lab is the umbrella organization for AI work on campus.[6] BAIR describes itself as bringing together researchers "across the areas of computer vision, machine learning, natural language processing, planning, control, and robotics," and reports more than 50 faculty and over 300 graduate students and postdoctoral researchers drawn from EECS, Statistics, and other departments.[6] The lab runs joint seminars, hosts industrial sponsors through the BAIR Commons program, and operates the BAIR Open Research Commons that gives partner companies (Google, Amazon, Microsoft, Meta, Samsung, and others) early access to research collaborations.[6]
Several specialized centers sit inside or alongside BAIR:
Berkeley's EECS department has run a sequence of five-year "big tent" systems labs that have repeatedly produced infrastructure used across the AI industry.
AMPLab (Algorithms, Machines and People Lab) launched in 2011 under Michael Franklin, Michael I. Jordan, and Ion Stoica.[17] It produced the Berkeley Data Analytics Stack (BDAS), whose components went on to become household names: Apache Spark (originally written by Matei Zaharia in 2009), Apache Mesos, and Tachyon (now Alluxio).[17][18] AMPLab ended in 2016.[17] Spark and the team behind it spun out Databricks in 2013, founded by Ali Ghodsi, Andy Konwinski, Arsalan Tavakoli-Shiraji, Ion Stoica, Matei Zaharia, Patrick Wendell, and Reynold Xin.[19] Databricks became one of the largest private software companies in the world.[19]
RISELab (Real-time Intelligent Secure Explainable systems) followed in 2017, again with Ion Stoica as founding director.[8] RISELab produced Ray, the distributed Python framework that has become a default substrate for large-scale reinforcement learning and LLM training and serving.[8] Graduate students Robert Nishihara and Philipp Moritz, with Stoica and Michael I. Jordan, founded Anyscale around Ray in 2019; the company launched publicly in December 2019 with a $20.6 million Series A led by Andreessen Horowitz.[29] Other RISELab spinouts include Opaque Systems and Ponder.
Sky Computing Lab opened in 2022 as the next chapter in this lineage, also led by Stoica.[7] Sky's research agenda is multi-cloud ("sky") infrastructure for AI, including projects like SkyPilot, SkyServe, vLLM, and the LMSYS chatbot platform that produced Vicuna and Chatbot Arena.[7][13]
vLLM is a high-throughput, memory-efficient inference and serving engine for large language models that originated in Berkeley's Sky Computing Lab and was first released in 2023.[28] Its core innovation is PagedAttention, described by the team as "an attention algorithm inspired by the classical virtual memory and paging techniques in operating systems," which manages the transformer key-value cache in non-contiguous blocks to achieve near-zero memory waste.[28] The foundational paper, "Efficient Memory Management for Large Language Model Serving with PagedAttention" by Woosuk Kwon, Zhuohan Li, Siyuan Zhuang, Ying Sheng, Lianmin Zheng, Cody Hao Yu, Joseph E. Gonzalez, Hao Zhang, and Ion Stoica, was presented at the ACM SIGOPS 29th Symposium on Operating Systems Principles (SOSP) in 2023.[28] Sky reports that vLLM "improves the throughput of popular LLMs by 2-4x with the same level of latency compared to the state-of-the-art systems, such as FasterTransformer and Orca."[28]
vLLM has since become one of the most widely used pieces of open-source AI infrastructure, with more than 70,000 GitHub stars and contributions from over 2,000 developers across many academic institutions and companies.[28] The project was contributed to the Linux Foundation in July 2024 and became a PyTorch Foundation-hosted project in 2025, reflecting its move from a university research effort to industry-standard serving infrastructure.[28]
The International Computer Science Institute is an independent non-profit research lab founded in 1988 and located at 1947 Center Street in downtown Berkeley.[12] ICSI has held a long-running affiliation agreement with the university; many of its researchers hold UC Berkeley faculty appointments.[12] Its work spans speech and natural language processing, computer vision, networking, security, and privacy.[12] ICSI was an early home for connectionist and speech recognition research and continues to be a quiet but important node in the Bay Area AI ecosystem.
| Faculty member | Department | Best known for |
|---|---|---|
| Stuart Russell | EECS | Coauthor of Artificial Intelligence: A Modern Approach (with Peter Norvig); founder of CHAI; AI safety advocate |
| Michael I. Jordan | EECS, Statistics | Probabilistic graphical models, variational inference, latent Dirichlet allocation; one of the most cited ML researchers in history |
| Pieter Abbeel | EECS | Deep reinforcement learning, robot learning; ACM Prize in Computing; cofounder of Covariant |
| Sergey Levine | EECS | Deep RL for robotics; cofounder of Physical Intelligence ("pi") |
| Anca Dragan | EECS | Human-robot interaction, value alignment; head of AI safety and alignment at Google DeepMind |
| Trevor Darrell | EECS | Computer vision, multimodal learning, codirector of Berkeley DeepDrive |
| Jitendra Malik | EECS | Computer vision, image segmentation; among the most cited researchers in vision |
| Alexei Efros | EECS | Computer vision, computational photography, image generation |
| Ion Stoica | EECS | Distributed systems; founder of AMPLab, RISELab, Sky Computing Lab; cofounder of Databricks and Anyscale |
| Dan Klein | EECS | Natural language processing, statistical parsing, semantics |
| Kurt Keutzer | EECS | Efficient deep learning, codirector of Berkeley DeepDrive |
| Bin Yu | Statistics, EECS | Statistical learning theory, interpretable ML |
| Joseph Gonzalez | EECS | Systems for ML, RISELab, Sky Computing Lab; coauthor of the vLLM PagedAttention paper |
| Aditi Krishnapriyan | Chemical Engineering, EECS | AI for science, scientific ML |
| Alumnus | Degree | Notable for |
|---|---|---|
| John Schulman | Ph.D., EECS, 2016 | Cofounder of OpenAI; creator of the TRPO and PPO algorithms (the latter underlies RLHF); later Anthropic, then chief scientist of Thinking Machines Lab |
| Aravind Srinivas | Ph.D., EECS, 2021 | Cofounder and CEO of Perplexity AI; advised by Pieter Abbeel; former OpenAI researcher |
| Chelsea Finn | Ph.D., EECS, 2018 | MAML and meta-learning; Stanford faculty; cofounder of Physical Intelligence |
| Deepak Pathak | Ph.D., EECS, 2019 | CMU faculty; cofounder of Skild AI |
| Jonathan Ho | Ph.D., EECS, 2020 | Denoising Diffusion Probabilistic Models (DDPM); cofounder of Ideogram |
| Misha Laskin | Ph.D., EECS, 2022 | Reinforcement learning; cofounder of Reflection AI |
| Roshan Rao | Ph.D., EECS, 2022 | Protein language models (ESM); EvolutionaryScale |
| Paul Christiano | Ph.D., EECS, 2017 | RLHF (deep reinforcement learning from human preferences); founded the Alignment Research Center; head of safety, U.S. AI Safety Institute |
| Woosuk Kwon | Ph.D. student, EECS | Lead author and cocreator of vLLM and PagedAttention |
| Matei Zaharia | Ph.D., EECS, 2013 | Created Apache Spark; cofounder and CTO of Databricks |
| Ali Ghodsi | Postdoc, AMPLab | CEO of Databricks |
| Robert Nishihara | Ph.D., EECS, 2019 | Cocreator of Ray; cofounder of Anyscale |
| Philipp Moritz | Ph.D., EECS, 2019 | Cocreator of Ray; cofounder of Anyscale |
| Peter Chen, Rocky Duan, Tianhao Zhang | Ph.D. students under Abbeel | Cofounders of Covariant |
This list is far from exhaustive; the dense pipeline from Berkeley graduate programs into AI research labs and frontier startups is one of the defining features of the modern San Francisco AI scene.
A partial list of companies founded by Berkeley AI faculty or graduate students:
| Company | Year | Berkeley founders | What they do |
|---|---|---|---|
| Databricks | 2013 | Matei Zaharia, Ion Stoica, Ali Ghodsi, Andy Konwinski, Arsalan Tavakoli-Shiraji, Patrick Wendell, Reynold Xin | Data and AI platform built on Apache Spark |
| Covariant | 2017 | Pieter Abbeel, Peter Chen, Rocky Duan, Tianhao Zhang | Robotic foundation models for warehouses (assets and team licensed to Amazon in 2024) |
| Anyscale | 2019 | Ion Stoica, Robert Nishihara, Philipp Moritz, Michael I. Jordan | Managed Ray for distributed Python and AI |
| Physical Intelligence ("pi") | 2024 | Sergey Levine, Karol Hausman, Brian Ichter, Lachy Groom, Chelsea Finn (Stanford) | General-purpose robot foundation models |
| Perplexity AI | 2022 | Aravind Srinivas (Berkeley Ph.D.), Andy Konwinski, Denis Yarats, Johnny Ho | Conversational answer engine |
| Skild AI | 2023 | Deepak Pathak (Berkeley Ph.D.) | Generalist robot "brain" |
| Ideogram | 2023 | Jonathan Ho (Berkeley Ph.D.) and Stanford coauthors | Text-to-image generation |
| Opaque Systems | 2021 | RISELab researchers | Confidential analytics for cloud data |
| Conviva | 2006 | Ion Stoica, Hui Zhang | Video analytics |
| SiFive | 2015 | Krste Asanovic, Yunsup Lee, Andrew Waterman | RISC-V processors and IP |
Berkeley played a visible role in the open chatbot wave that followed the release of Meta's LLaMA in early 2023. The Sky Computing Lab and the LMSYS group, working with collaborators at CMU, Stanford, UC San Diego, and MBZUAI, released Vicuna on March 30, 2023, an open chatbot fine-tuned from LLaMA on roughly 70,000 user conversations from ShareGPT.[13] The team titled its announcement "Vicuna: An Open-Source Chatbot Impressing GPT-4 with 90%* ChatGPT Quality," reporting that Vicuna-13B reached more than 90% of the response quality of ChatGPT and Bard in pairwise GPT-4 evaluations and cost about $300 to train, results that helped kick off the open LLM ecosystem.[13] The same group launched Chatbot Arena and the LMSYS leaderboard, which became the most widely watched human-preference benchmark for LLMs.[7]
Other recent Berkeley AI projects include:
| Project / paper | Year | Group | What it is |
|---|---|---|---|
| Koala | April 2023 | BAIR | LLaMA-based chatbot fine-tuned on dialogue data; one of the earliest "academic" alternatives to ChatGPT |
| Vicuna and Chatbot Arena | March 2023 | LMSYS, Sky Lab | Open chatbot and the most widely cited human-preference LLM leaderboard |
| vLLM and PagedAttention | 2023 | Sky Computing Lab | Open-source LLM serving engine; 2-4x throughput over prior systems |
| Gorilla | May 2023 | Sky Computing Lab | Fine-tuned LLaMA for API-call generation that beat GPT-4 on its benchmark |
| Berkeley Function-Calling Leaderboard (BFCL) | February 2024 | Sky Computing Lab | Standard benchmark for tool use in LLMs |
| RAFT (Retrieval-Augmented Fine-Tuning) | March 2024 | Sky Computing Lab | Fine-tuning recipe for domain-specific RAG |
| BDD100K | 2018 | Berkeley DeepDrive | Largest open driving dataset with 100k videos and rich labels |
| World models / V-JEPA collaborations | 2024-2025 | BAIR | Joint work with Meta FAIR on self-supervised video representation |
No single ranking captures Berkeley's profile, but it appears at or near the top of every reputable list, especially in computer science, engineering, and the basic sciences.[26]
| Ranking | Year | Position |
|---|---|---|
| U.S. News "Best Public University in the U.S." | 2024-25 | #1 |
| U.S. News graduate Computer Science | 2024 | #2 (tied with Stanford and CMU) |
| U.S. News graduate Computer Engineering | 2024 | #1 (tied with MIT) |
| U.S. News graduate Electrical Engineering | 2024 | #1 (tied with Stanford and MIT) |
| U.S. News undergraduate engineering | 2025 | #3 |
| U.S. News graduate Data Science | 2026 edition | #1 |
| QS World University Rankings, Computer Science | 2025 | #4 |
| QS World University Rankings, Engineering and Technology | 2025 | #5 |
| Times Higher Education World University Rankings | 2025 | #8 |
| Academic Ranking of World Universities (ShanghaiRanking) | 2024 | #5 |
Berkeley reports 63 Nobel laureates affiliated with the university (a count that includes faculty, staff, and alumni at the time the Prize was awarded).[1] Sixteen of those Prizes came through the joint Berkeley campus and Berkeley Lab partnership.[16] Some of the most well-known Berkeley laureates include:
In October 2025 the broader UC system set a record by producing five new Nobel laureates in a single year, with Berkeley contributing several.
Berkeley fields 30 varsity sports as the California Golden Bears.[3] The university left the Pac-12 in 2024 and joined the Atlantic Coast Conference (ACC) for most sports starting that season, after the Pac-12 effectively dissolved.[3] Cal has won 107 NCAA team national championships and Berkeley athletes have collected 223 Olympic medals across the modern Olympic era.[3] The mascot is Oski the Bear and the colors are Berkeley Blue and California Gold (the latter is the official state color of California, partly because of Cal).
The central rivalry is with Stanford. Their football game, played annually since 1892, is called the Big Game, the oldest college football rivalry on the West Coast.[21] The winning team takes home the Stanford Axe, a trophy that has changed hands by both legitimate and theatrically illegitimate means since 1899.[21] The most famous Big Game was the 1982 contest at Berkeley, which ended on "The Play": a five-lateral kickoff return by Cal that wound through the Stanford marching band, who had taken the field early thinking the game was over, and into the end zone for the winning touchdown.[21]
Beyond LBNL, Berkeley anchors or hosts several major research institutions:
Beyond AI, Berkeley alumni include J. Robert Oppenheimer (faculty director of the Manhattan Project), Earl Warren (U.S. Chief Justice), Steve Wozniak (cofounder of Apple), Eric Schmidt (former Google CEO), and authors Joan Didion, Maxine Hong Kingston, and Philip K. Dick.[3] The campus has a notable connection to early Silicon Valley through faculty like David A. Patterson (RISC, RAID) and John Hennessy collaborator David Wessel, and through alumni who went on to Apple, Sun, Cisco, Google, and many others. (For AI-specific people, see the tables above.)