# Hal Varian Hal Varian is an American economist specializing in microeconomics and information economics, best known as the chief economist at Google from 2002 to 2025 and for his influential textbooks on microeconomics. Hal Ronald Varian (born March 18, 1947) is an American economist specializing in microeconomics and information economics. He served as the chief economist at Google from 2002 until his retirement in August 2025, where he played a key role in developing the company's advertising model and data analysis practices. Varian is also an emeritus professor at the University of California, Berkeley, where he was the founding dean of the School of Information. Varian is widely known for his influential textbooks, including *Intermediate Microeconomics* and *Microeconomic Analysis*, which are used in economics courses worldwide. His research has focused on the economics of information technology, network effects, and pricing strategies, making him a prominent figure in the field of information economics. ## Early Life and Education Varian was born on March 18, 1947, in Wooster, Ohio. He earned his Bachelor of Science in economics from the Massachusetts Institute of Technology (MIT) in 1969. He then pursued graduate studies at the University of California, Berkeley, where he received a Master of Arts in mathematics and a Ph.D. in economics in 1973. ## Academic Career Before joining Google, Varian held academic positions at several prestigious institutions. He taught at MIT, Stanford University, the University of Oxford, the University of Michigan, and the University of Siena, among others. In 1995, he became the founding dean of the School of Information at the University of California, Berkeley, a role he held until 2002. He has received honorary doctorates from the University of Oulu in Finland (2002) and the Karlsruhe Institute of Technology in Germany (2006). ## Work at Google Varian joined Google in 2002 as its chief economist, a position he held for over two decades. During his tenure, he contributed to the design of Google's advertising auctions, which are central to the company's revenue model. He also worked on issues related to econometrics, corporate strategy, and public policy. His work at Google bridged academic research and practical applications in the technology industry. In September 2023, Varian testified in the United States v. Google antitrust lawsuit brought by the Department of Justice. The case involved a memo he wrote in 2003 titled "Thoughts on Google v Microsoft," in which he advised employees to avoid using certain language in communications, such as "market share," "scale," "network effects," "leverage," "lock up," "lock in," "bundle," and "tie," to prevent perceptions of monopolistic behavior. The DOJ cited these memos as evidence of Google's awareness of antitrust concerns. ## Contributions to Economics Varian's academic work has significantly influenced the study of information economics. He co-authored *Information Rules: A Strategic Guide to the Network Economy* with Carl Shapiro, a foundational text on how businesses compete in the digital age. He also co-authored *The Economics of Information Technology: An Introduction* with Shapiro. According to the Open Syllabus Project, Varian is the fourth most frequently cited author on college syllabi for economics courses, reflecting the widespread use of his textbooks. ## Personal Life Varian is married and has one child, Christopher Max Varian. He has maintained a public presence through his writings and lectures, often discussing the intersection of technology and economics. ## See Also - [artificial-intelligence](https://www.wikiprompt.org/wiki/artificial-intelligence) - [machine-learning](https://www.wikiprompt.org/wiki/machine-learning) - [google-cloud](https://www.wikiprompt.org/wiki/google-cloud) - [stanford-ai-lab](https://www.wikiprompt.org/wiki/stanford-ai-lab) - [berkeley-ai-research](https://www.wikiprompt.org/wiki/berkeley-ai-research) - [mit-csail](https://www.wikiprompt.org/wiki/mit-csail) - [carnegie-mellon-university](https://www.wikiprompt.org/wiki/carnegie-mellon-university) - [university-of-toronto](https://www.wikiprompt.org/wiki/university-of-toronto) - [oxford-university](https://www.wikiprompt.org/wiki/oxford-university) - [amazon-web-services](https://www.wikiprompt.org/wiki/amazon-web-services) - microsoft-azure - [openai](https://www.wikiprompt.org/wiki/openai) - [anthropic](https://www.wikiprompt.org/wiki/anthropic) - [google-deepmind](https://www.wikiprompt.org/wiki/google-deepmind) - [generative-ai](https://www.wikiprompt.org/wiki/generative-ai) - [large-language-model](https://www.wikiprompt.org/wiki/large-language-model) - [neural-network](https://www.wikiprompt.org/wiki/neural-network) - [deep-learning](https://www.wikiprompt.org/wiki/deep-learning) - [transformer](https://www.wikiprompt.org/wiki/transformer) - [waymo](https://www.wikiprompt.org/wiki/waymo) ## References - Varian, H. R. (2019). *Intermediate Microeconomics: A Modern Approach* (9th ed.). W. W. Norton & Company. - Varian, H. R. (1992). *Microeconomic Analysis* (3rd ed.). W. W. Norton & Company. - Shapiro, C., & Varian, H. R. (1999). *Information Rules: A Strategic Guide to the Network Economy*. Harvard Business School Press. - Shapiro, C., & Varian, H. R. (2003). *The Economics of Information Technology: An Introduction*. Cambridge University Press. - United States v. Google LLC, Case No. 1:20-cv-03010 (D.D.C. 2020). ## External Links - Hal Varian's personal website - Hal Varian publications indexed by Google Scholar - Hal Varian on JSTOR - Hal Varian appearances on C-SPAN --- Source: https://www.wikiprompt.org/wiki/hal-varian License: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/) Last updated: 2026-09-05T13:29:54.966362+00:00