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Reynold Xin

Co-Founder and Chief Architect, Databricks

Reynold Xin is a co-founder of Databricks and its Chief Architect, according to Databricks' Data + AI Summit 2026 speaker page. Xin is listed on the Apache Spark project's committers page and is a bylined author of Databricks' July 2026 post introducing Apache Spark 4.2. Earlier, Xin was first author of the papers on Shark, a system for SQL and rich analytics at scale (2012), and GraphX, which unifies data-parallel and graph-parallel analytics (2014). Xin is also one of the bylined authors of Databricks' June 2024 post on open-sourcing Unity Catalog.123456

At a glance

Current role
Co-Founder and Chief Architect
Company
Databricks
Sector
Company
Education
UC Berkeley, Toronto
Work listed
3
Sources cited
13
Profile reviewed

Research

Xin's early research was on systems for large-scale analytics. In 2012 Xin posted a single-author essay arguing that the next generation of data warehouse systems should be modular and support both SQL and machine learning, and was first author of the Shark paper on running SQL and rich analytics at scale. Xin was also first author of GraphX (2014), which unifies data-parallel and graph-parallel analytics.845

Xin co-authored the 2015 paper describing MLlib, the machine learning library in Apache Spark. With Databricks colleagues, Xin co-authored the VLDB 2020 paper on Delta Lake, a storage layer for ACID tables on cloud object stores, and the CIDR 2021 paper "Lakehouse", which argues for data platforms built on open direct-access formats with built-in support for machine learning.91011

Databricks and Apache Spark

Xin is a co-founder of Databricks and serves as its Chief Architect, and is listed among the committers of the Apache Spark project, which is developed under the Apache-2.0 license. Xin is a bylined author of Databricks' June 2024 post on open-sourcing Unity Catalog and of the July 2026 post introducing Apache Spark 4.2.12126133

Work and contributions

  • Apache Spark Open-source code

    Listed as a committer on the Apache Spark committers page, and a bylined author of Databricks' July 2026 post introducing Apache Spark 4.2. The apache/spark repository is published under the Apache-2.0 license.2312

  • Shark and GraphX Published research

    First author of "Shark: SQL and Rich Analytics at Scale" (2012) and of "GraphX: Unifying Data-Parallel and Graph-Parallel Analytics" (2014).45

  • Unity Catalog Open-source code

    One of five bylined authors of the June 2024 Databricks post announcing that Unity Catalog was being open-sourced under the Apache 2.0 license and hosted at LF AI & Data. The repository is Apache-2.0.613

Timeline

  1. Posted "The End of an Architectural Era for Analytical Databases" as sole author.8
  2. Posted the Shark paper on SQL and rich analytics at scale as first author.4
  3. Posted the GraphX paper as first author.5
  4. Co-authored "MLlib: Machine Learning in Apache Spark".9
  5. Co-authored the VLDB paper describing Delta Lake.10
  6. Co-authored the CIDR 2021 paper describing the Lakehouse architecture.11
  7. Co-authored the Databricks post announcing the open-sourcing of Unity Catalog.6
  8. Co-authored the Databricks post introducing Apache Spark 4.2.3

Where they work

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References

13 sources · profile reviewed Oct 21, 2026 · data updated Oct 21, 2026

  1. Reynold Xin — Data + AI Summit 2026 speaker pageDatabricks · Official page · accessed Oct 21, 2026
  2. Committers | Apache SparkApache Spark (Apache Software Foundation) · Official page · accessed Oct 21, 2026
  3. Introducing Apache Spark 4.2 (Databricks blog)Databricks · Announcement · published Jul 16, 2026 · accessed Oct 21, 2026
  4. Shark: SQL and Rich Analytics at Scale (arXiv 1211.6176)arXiv · Paper · published Nov 27, 2012 · accessed Oct 21, 2026
  5. GraphX: Unifying Data-Parallel and Graph-Parallel Analytics (arXiv 1402.2394)arXiv · Paper · published Feb 11, 2014 · accessed Oct 21, 2026
  6. Open sourcing Unity Catalog (Databricks blog)Databricks · Announcement · published Jun 13, 2024 · accessed Oct 21, 2026
  7. rxin (Reynold Xin) on GitHubGitHub · Official page · accessed Oct 21, 2026
  8. The End of an Architectural Era for Analytical Databases (arXiv 1209.1425)arXiv · Paper · published Sep 6, 2012 · accessed Oct 21, 2026
  9. MLlib: Machine Learning in Apache Spark (arXiv 1505.06807)arXiv · Paper · published May 26, 2015 · accessed Oct 21, 2026
  10. Delta Lake: High-Performance ACID Table Storage over Cloud Object Stores (PVLDB vol. 13)VLDB Endowment · Paper · published 2020 · accessed Oct 21, 2026
  11. Lakehouse: A New Generation of Open Platforms that Unify Data Warehousing and Advanced Analytics (CIDR 2021)CIDR · Paper · published 2021 · accessed Oct 21, 2026
  12. apache/spark repository (Apache-2.0 license)Apache Software Foundation (GitHub repository) · Repository · accessed Oct 21, 2026
  13. unitycatalog/unitycatalog repository (Apache-2.0 license)Unity Catalog (GitHub repository) · Repository · accessed Oct 21, 2026