# Mark Handley

> British computer scientist

**Wikidata**: [Q6767908](https://www.wikidata.org/wiki/Q6767908)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Mark_Handley_(computer_scientist))  
**Source**: https://4ort.xyz/entity/mark-handley

## Summary
Mark Handley is a British computer scientist known for his pioneering work in network theory, particularly in Internet multicast, telephony, and congestion control. He is a professor at University College London and a Fellow of the Royal Society, recognized for shaping open Internet standards and open-source systems.

## Biography
- Born: [Not available in source material]
- Nationality: United Kingdom
- Education: University College London, University of London
- Known for: Contributions to Internet multicast, telephony, congestion control, and open Internet standards
- Employer(s): University College London
- Field(s): Network theory, computer science

## Contributions
Mark Handley has made significant contributions to Internet protocols and systems. He co-authored **RFC 2117**, the **Protocol Independent Multicast-Sparse Mode (PIM-SM)** specification, which became a foundational standard for multicast routing in 1997. His work on **Internet telephony** and **congestion control** has influenced modern networking technologies. Handley has also contributed to open-source systems and has been recognized with the **IEEE Internet Award (2012)** for his impact on Internet standards. His research spans multicast protocols, network architecture, and real-time communication systems, with numerous publications and citations in academic and industry circles.

## FAQs
### Q: What is Mark Handley best known for?
A: Mark Handley is best known for his work on **Internet multicast protocols**, particularly **PIM-SM (RFC 2117)**, and his contributions to **Internet telephony and congestion control**.

### Q: Where does Mark Handley work?
A: He is a professor at **University College London (UCL)** and has been affiliated with the **University of London**.

### Q: Has Mark Handley received any major awards?
A: Yes, he received the **IEEE Internet Award (2012)** and was elected a **Fellow of the Royal Society (2019)**.

### Q: What is Mark Handley’s Twitter handle?
A: His Twitter handle is **@markjhandley**, active since 2012.

### Q: Who was Mark Handley’s doctoral advisor?
A: His doctoral advisor was **Jon Crowcroft**, a prominent British computer scientist.

## Why They Matter
Mark Handley’s work has fundamentally shaped how data is transmitted over the Internet. His contributions to **multicast routing (PIM-SM)** enabled efficient group communication, while his research on **congestion control** improved network reliability. His open-source contributions and standards work have influenced modern networking infrastructure, making the Internet more scalable and resilient. Without his work, real-time applications like video conferencing and live streaming might not function as efficiently today.

## Notable For
- Co-author of **RFC 2117 (PIM-SM)**, a key Internet multicast standard.
- Recipient of the **IEEE Internet Award (2012)** for contributions to Internet standards.
- Elected **Fellow of the Royal Society (2019)**.
- Doctoral advisor to notable researchers like **Andrea Bittau** and **Hendrik Knoche**.
- Active contributor to **open-source systems** and Internet protocols.

## Body
### Early Life and Education
Mark Handley earned his education at **University College London (UCL)** and the **University of London**, where he studied computer science. His doctoral advisor was **Jon Crowcroft**, a leading figure in networking research.

### Career and Research
Handley’s career has focused on **network theory**, particularly **Internet multicast, telephony, and congestion control**. His most cited work, **RFC 2117 (PIM-SM)**, remains a cornerstone of multicast routing. He has also contributed to **real-time communication protocols** and **open-source networking tools**.

### Awards and Recognition
- **IEEE Internet Award (2012)**: For contributions to Internet multicast, telephony, and congestion control.
- **Fellow of the Royal Society (2019)**: Recognized for his impact on Internet standards and systems.
- **Royal Society Wolfson Fellowship**: Awarded for his research excellence.

### Online Presence
Handley maintains an active presence on **Twitter (@markjhandley)** and has a **Google Scholar profile** with numerous citations. His **personal website** is hosted at UCL, and he engages with the tech community on platforms like **Hacker News (mhandley)**.

### Influence and Legacy
Handley’s work has been foundational in **Internet protocol development**, influencing both academic research and industry standards. His students and collaborators continue to advance networking technologies, ensuring his legacy in the field.

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## References

1. Mathematics Genealogy Project
2. [Source](https://www.ieee.org/content/dam/ieee-org/ieee/web/org/about/awards/recipients/internet-rl.pdf)
3. [Source](https://royalsociety.org/news/2019/04/royal-society-announces-2019-fellows/)
4. [Source](https://discovery.ucl.ac.uk/id/eprint/1322706/1/1322706.pdf)
5. [Source](http://www0.cs.ucl.ac.uk./staff/M.Handley)