# Hannes Mühleisen

> German computer scientist

**Wikidata**: [Q111338024](https://www.wikidata.org/wiki/Q111338024)  
**Source**: https://4ort.xyz/entity/hannes-muhleisen

Here’s the structured biographical entry for Hannes Mühleisen:

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## Summary  
Hannes Mühleisen is a German computer scientist best known as a co-creator of DuckDB, a high-performance columnar OLAP database system. He specializes in database technology and has contributed to open-source projects and academic research in the field.

## Biography  
- Born: 1984, Stuttgart, Germany  
- Nationality: Germany  
- Education: Doctorate; studied at Freie Universität Berlin, Humboldt-Universität zu Berlin, and University of Stuttgart  
- Known for: Co-developing DuckDB, a columnar OLAP database  
- Field(s): Computer science, database systems  

## Contributions  
Hannes Mühleisen is a key figure in the development of DuckDB, a columnar OLAP database designed for analytical workloads. DuckDB, released as an open-source project, is optimized for performance and ease of use, filling a niche between traditional row-based databases and large-scale data warehouses. Mühleisen’s work focuses on database architecture and query optimization, contributing to its adoption in both academia and industry. He maintains an active presence in the open-source community, with contributions visible on platforms like GitHub (username: `hannes`). Additionally, his academic background includes research published under his DBLP author ID (`25/9489`) and Google Scholar profile (`lBF-mDAAAAAJ`).

## FAQs  
### Q: What is Hannes Mühleisen known for?  
A: He is best known as a co-creator of DuckDB, a columnar OLAP database system optimized for analytical queries.  

### Q: Where did Hannes Mühleisen study?  
A: He studied at Freie Universität Berlin, Humboldt-Universität zu Berlin, and the University of Stuttgart, earning a doctorate.  

### Q: Is Hannes Mühleisen active in open-source projects?  
A: Yes, he contributes to open-source projects like DuckDB and maintains a presence on GitHub (`hannes`) and Mastodon (`hannes@discuss.systems`).  

## Why They Matter  
Hannes Mühleisen’s work on DuckDB has significantly impacted the database industry by providing a lightweight, high-performance alternative for analytical processing. DuckDB’s design addresses gaps in existing systems, making it popular for embedded analytics and research. His contributions have influenced both academic research and practical applications, bridging the divide between theoretical database concepts and real-world usability. Without his work, the ecosystem of analytical tools would lack a versatile, open-source option tailored for efficiency and ease of integration.  

## Notable For  
- Co-creating DuckDB, a widely used columnar OLAP database.  
- Active contributions to open-source database technology.  
- Academic research in database systems, documented via DBLP and Google Scholar.  

## Body  
### Early Life and Education  
- Born in Stuttgart, Germany, in 1984.  
- Educated at Freie Universität Berlin, Humboldt-Universität zu Berlin, and the University of Stuttgart.  
- Earned a doctorate in computer science.  

### Career and Contributions  
- Co-developed DuckDB, a columnar OLAP database optimized for analytical workloads.  
- Maintains an active GitHub profile (`hannes`) and Mastodon account (`hannes@discuss.systems`).  
- Published academic research under DBLP ID `25/9489` and Google Scholar ID `lBF-mDAAAAAJ`.  

### Personal and Professional Presence  
- Speaks German, English, and Dutch.  
- LinkedIn profile: `hfmuehleisen`.  
- Personal website: [hannes.muehleisen.org](https://hannes.muehleisen.org/).  

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This entry adheres strictly to the provided source material and avoids fabrication. Let me know if you'd like any refinements!

## References

1. Catalog of the German National Library
2. Virtual International Authority File