# Jon Crowcroft

> British computer scientist

**Wikidata**: [Q6270547](https://www.wikidata.org/wiki/Q6270547)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Jon_Crowcroft)  
**Source**: https://4ort.xyz/entity/jon-crowcroft

## Summary
Jon Crowcroft is a British computer scientist and professor known for his foundational contributions to Internet protocols. His most notable work includes authoring RFC 2309, which provided key recommendations on queue management and congestion avoidance, helping to ensure the stability of the internet.

## Biography
- **Born**: 1957-11-23, England
- **Nationality**: United Kingdom
- **Education**: Westminster School, Trinity College, University of Cambridge, University College London
- **Known for**: Contributions to Internet protocols, including queue management and congestion avoidance.
- **Employer(s)**: Wolfson College
- **Field(s)**: Computer Science

## Contributions
Jon Crowcroft's contributions have been central to the development and stability of the internet. His most cited work is RFC 2309, "Recommendations on Queue Management and Congestion Avoidance in the Internet," which addressed critical issues of network traffic management. This work provided a framework for routers to handle data packets more intelligently, preventing the network collapses that can occur under heavy load.

His research extends across a wide range of internet architecture topics. The citation for his 2014 IEEE Internet Award highlights his work in multicast, transport protocols, quality of service (QoS), security, mobility, and opportunistic networking. These areas represent fundamental building blocks of the modern internet, from efficiently streaming media to multiple users (multicast) to ensuring reliable data delivery and enabling mobile connectivity. As a professor, he has also shaped the next generation of computer scientists, having advised notable researchers like Mark Handley and Paul Dourish during their doctoral studies.

## FAQs
### Q: What is Jon Crowcroft most famous for?
A: Jon Crowcroft is most famous for his work on Internet protocols, particularly for authoring RFC 2309, which established influential recommendations for managing network congestion and improving internet stability.

### Q: What awards has Jon Crowcroft received?
A: He has received numerous prestigious awards, including the SIGCOMM Award (2009), the IEEE Internet Award (2014), and fellowships in the Royal Society (2013) and the Association for Computing Machinery (ACM) (2002).

### Q: Who was Jon Crowcroft's doctoral advisor?
A: His doctoral advisor was the British computer scientist Peter T. Kirstein.

## Why They Matter
Jon Crowcroft's work is significant because it addressed fundamental engineering challenges that could have limited the internet's growth and reliability. His research on congestion control, outlined in RFC 2309, provided practical solutions that have been instrumental in allowing the internet to scale from a small academic network to a global communications infrastructure. Without robust mechanisms for queue and congestion management, the internet would be far more prone to slowdowns and outages.

His influence extends beyond specific protocols. By contributing across a wide spectrum of networking—from security and mobility to quality of service—he has helped build a more versatile and resilient internet. Furthermore, his role as an educator and mentor to prominent computer scientists like Mark Handley and Paul Dourish has created a lasting legacy, propagating his expertise and shaping the continued evolution of network science. His work is a key reason why the internet functions as reliably as it does today under immense and ever-growing demand.

## Notable For
- **Fellow of the Royal Society**: Elected a Fellow of the Royal Society (FRS) in 2013.
- **ACM Fellow**: Recognized as an ACM Fellow in 2002 by the Association for Computing Machinery.
- **IEEE Internet Award**: Received the award in 2014 for "contributions to research in and teaching of Internet protocols."
- **SIGCOMM Award**: Honored with the prestigious SIGCOMM Award in 2009 for his contributions to the field of data communications.
- **RFC 2309**: Authored the landmark paper "Recommendations on Queue Management and Congestion Avoidance in the Internet," a key document in network engineering.

## Body
### Personal Life and Education
- **Full Name**: Jonathan Andrew Crowcroft
- **Born**: 1957-11-23 in England.
- **Nationality**: United Kingdom.
- **Education**: Crowcroft was educated at Westminster School, Trinity College, the University of Cambridge, and University College London.
- **Doctoral Advisor**: His doctoral advisor was Peter T. Kirstein.

### Academic Career
- **Occupations**: Computer scientist and professor.
- **Employer**: He is employed by Wolfson College.
- **Mentorship**: He has supervised numerous doctoral students who have become notable computer scientists, including:
    - Mark Handley
    - Paul Dourish
    - Paul Francis
    - Sheharbano Khattak

### Research and Publications
Crowcroft's research focuses on Internet protocols. His work has made significant contributions to the following areas:
- Queue Management and Congestion Avoidance
- Multicast
- Transport Protocols
- Quality of Service (QoS)
- Security
- Mobility
- Opportunistic Networking

His most notable publication is **RFC 2309**: "Recommendations on Queue Management and Congestion Avoidance in the Internet."

### Awards and Recognition
- **2002**: Elected an ACM Fellow.
- **2009**: Received the SIGCOMM Award.
- **2013**: Elected a Fellow of the Royal Society.
- **2014**: Received the IEEE Internet Award.

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## References

1. Virtual International Authority File
2. [Source](https://www.ieee.org/content/dam/ieee-org/ieee/web/org/about/awards/recipients/internet-rl.pdf)
3. [Source](https://awards.acm.org/fellows/award-recipients)
4. [Source](https://web.archive.org/web/20140425000218/https://royalsociety.org/about-us/fellowship/new-fellows-2013/)
5. Mathematics Genealogy Project
6. International Standard Name Identifier
7. Google Knowledge Graph
8. National Library of Israel Names and Subjects Authority File