# Ion Stoica

Ion Stoica is a Romanian-American computer scientist, UC Berkeley professor, and co-founder of Databricks and Anyscale. He is known for contributions to distributed systems and cloud computing, including Apache Spark and Ray.

Ion Stoica (born 1964 or 1965) is a Romanian-American computer scientist specializing in distributed systems, cloud computing, and computer networking. He is a professor of computer science at the University of California, Berkeley, and co-director of AMPLab. Stoica co-founded Conviva and Databricks with other original developers of Apache Spark, and Anyscale with other original developers of Ray. In 2022, Forbes ranked him and Matei Zaharia as the 3rd-richest Romanians with a net worth of US$1.6 billion.

Stoica's research has shaped modern data infrastructure, particularly through the Apache Spark cluster-computing framework and the Ray distributed-computing engine. His work bridges academic theory and industrial application, with over 100 peer-reviewed papers and multiple commercial ventures that have become foundational to big-data processing and [machine-learning](https://www.wikiprompt.org/wiki/machine-learning) workloads.

## Education

Stoica was born in Romania, where he grew up and attended Polytechnic University of Bucharest, receiving an MS in Electrical Engineering and Computer Science in 1989. He moved to the U.S. in 1994 to start a PhD at Old Dominion University with computer-science professor Hussein Abdel-Wahab. Together, in 1995 they published the algorithm for earliest eligible virtual deadline first scheduling, which is the current process scheduler in the Linux kernel. In 1996, he transferred to [Carnegie Mellon University](https://www.wikiprompt.org/wiki/carnegie-mellon-university) (CMU), where in 2000 he received a PhD in Electrical & Computer Engineering supervised by Hui Zhang. His dissertation topics included Chord (peer-to-peer), Core-Stateless Fair Queueing (CSFQ), and Internet Indirection Infrastructure (i3).

## Career and research

Stoica has been a Berkeley professor since 2000. His research interests include cloud computing, networking, distributed systems, and big data. He has authored or co-authored more than 100 peer-reviewed papers in various areas of computer science. He is one of the inventors of dominant resource fairness, a principle used in resource allocation for multi-tenant clusters.

Stoica was a co-founder and Chief Technology Officer (CTO) of Conviva in 2006, a company that emerged from the End System Multicast project at CMU. In 2013 he co-founded [Databricks](https://www.wikiprompt.org/wiki/databricks), along with Ali Ghodsi, Matei Zaharia, Patrick Wendell, Reynold Xin, Andy Konwinski, and Arsalan Tavakoli-Shiraji. He served as its chief executive until being replaced by Ali Ghodsi in January 2016, when he became executive chairman. Databricks grew into a major player in cloud-computing and data analytics, leveraging Apache Spark.

Stoica subsequently co-founded [Anyscale](https://www.wikiprompt.org/wiki/anyscale) with other original developers of Ray, a distributed-computing framework widely adopted for scaling [artificial-intelligence](https://www.wikiprompt.org/wiki/artificial-intelligence) and [deep-learning](https://www.wikiprompt.org/wiki/deep-learning) applications. His work at Anyscale has focused on simplifying the deployment of complex AI systems across clusters, aligning with broader trends in [generative-ai](https://www.wikiprompt.org/wiki/generative-ai) and [large-language-model](https://www.wikiprompt.org/wiki/large-language-model) training.

## Awards

Stoica, under the supervision of his doctoral advisor Hui Zhang, won the Association for Computing Machinery PhD Dissertation Award in 2001 for his thesis "Stateless Core: A Scalable Approach for Quality of Service in the Internet" (2000). He is a recipient of a SIGCOMM Test of Time Award (2011), the 2007 CoNEXT Rising Star Award, a Sloan Foundation Fellowship (2003), and a PECASE Award (2002). Stoica is also an ACM Fellow. In 2019, he received the SIGOPS Mark Weiser Award.

## Philanthropy

In June 2021, Berkeley announced that Stoica had donated $25 million toward the university's computing and data science initiatives, making him and colleague Scott Shenker two of Berkeley's largest benefactors. The donation supports research and education in data science, reinforcing Berkeley's role as a hub for [Berkeley AI Research](https://www.wikiprompt.org/wiki/berkeley-ai-research).

## References

- List of publications, Berkeley website.

## Publications

Stoica has published extensively in top conferences and journals, including SIGCOMM, SOSP, and NSDI. His notable works include the Chord distributed hash table, the Spark cluster-computing system, and the Ray framework. These contributions have influenced both academic research and industry practice in distributed systems.

His ongoing work addresses challenges in scaling AI, particularly through [reinforcement-learning](https://www.wikiprompt.org/wiki/reinforcement-learning) and [model-pruning](https://www.wikiprompt.org/wiki/model-pruning) techniques. Stoica's influence extends to mentoring a generation of researchers and engineers who have gone on to lead major tech initiatives.

---
Source: https://www.wikiprompt.org/wiki/ion-stoica
License: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/)
Last updated: 2026-09-12T22:25:11.734336+00:00