Piers O'Hanlon

P.OHanlon AT piersohanlon.com

I provide consultancy services in the areas of Internet based media transport such as SIP, RTP, and other VoIP technologies, and in custom software development on multiple platforms (Linux, OSX, Windows). I've been involved with the Internet Engineering Task Force (IETF) for more than a decade and have authored a number of drafts and two RFCs. I've also provided consulting for interactive art installations, one of which showed at Tate Britain. I currently work part-time at the Oxford Internet Institute at Oxford University. I previously worked in the Networks Group at the computer science department of University College London.


Currently I am working on communication security at the Oxford Internet Institute. I am also doing consulting work on Internet protocol standards (IETF work in the Audio/Video Transport Core Maintenance (AVTCORE), and Transport Area (TSV) working Groups), and some other work on conferencing systems, and robotic control systems.

At UCL I worked on the EU Trilogy Project doing performance testing of Multipath TCP. Before that I was working on the EU GLOBAL project - integrating VOIP solutions with the Isabel conferencing system. I also lectured on IPv6 (security, MobileIPv6, Multicast, MLD etc) at international workshops as part of the EU 6DEPLOY project, and previously 6DISS.

Previously I managed the OMII-UK funded AVATS project - which provided support for the Media tools (VIC,RAT,UCL common lib) - widely used in Advanced Collaborative Environments such as AccessGrid. Prior to this I managed the SUMOVER project which provided support and development of the media tools - integrating a number of enhancements, bringing the code into a common code base, and deploying the Trac and Subversion based code management system.

Prior to that I was working with IPv6 in a number of projects; The 6NET project was involved with building and testing an IPv6 research network across Europe, and also worked on the Grid. Before that I worked on 6WINIT which was deploying and testing Mobile applications on IPv6. The project was one of the first to test IPv6 over Ericsson's 3G research network in Stockholm (in 2002). I am currently co-chair of the OGF IPv6 Working Group - though the group is now dormant.

Earlier I worked on Active Networks in the RADIOACTIVE and ANDROID projects. We were mainly concerned with Application Level Active Networks (ALAN) and policies. I was also involved with the COIAS and MECCANO projects - porting, testing and developing the Multimedia Mbone tools. Prior to this I worked on the ALAVIT project which involved testing and cataloguing desktop videoconferencing products - Both end systems and gateways/gatekeepers in context of H.323 and Mbone.

Whilst in UCL's old Multimedia Support and Communications Centre (MMSCC) I worked on a number of projects; Before I left I was working on the ARIADNE project which is developing a distributed database of reuseable computer based teaching materials, with associated tools for developing courses and material. In parallel I was involved in the ASITIL project which involved setting up an ATM LAN for testing and some development of video server and teaching systems, with a view to implement smooth two-way integration between the digital network of desk-top computers, and analogue networks such as the UCL LIVE-NET network. In 1995 I worked on the INSURRECT project, which involved developing and testing technology to do surgical teaching over digital (ATM and IP) videoconference links - between 5 major medical teaching hospitals around the UK. Prior to that I worked on the MTS project under EU Framework IV developing remote teaching techniques for low cost teaching over satellite links.

Whilst at UCL I maintained the RTP based videoconference tool (vic), originally from Laurence Berkeley Laboratories, and worked on the other UCL Media tools, including the UCL common multimedia library.

Email me for my CV.

Other published documents

Contributions at international conferences, published in proceedings

  • P. O'Hanlon, K. Carlberg, DFlow: Low delay congestion Control,, Capacity Sharing Workshop (CSWS13), co-located with the 21st International Conference on Network Protocols (ICNP'13), October 2013, Göttingen, Germany. To be published on IEEE Xplore.
  • T. de Souza, J. Wright, P. O'Hanlon, I. Brown, Set Difference Attacks in Wireless Sensor Networks, Proceedings of SecureComm, Italy, September 2012.
  • P. O'Hanlon, The AVATS and SUMOVER projects: The media tools continue, Proceedings of the 8th Annual AccessGrid Retreat, Vancouver, Canada, May 2008.
  • P. O'Hanlon, Taking the media tools forward, Proceedings of the 6th Annual AccessGrid Retreat, Ann Arbour, MI, USA, May 2006.
  • P. O'Hanlon, IPv6 and the Access Grid, Proceedings of the 4th Annual AccessGrid Retreat, Toronto, Canada, May 2004.
  • S. Jiang, P. O'Hanlon, P. Kirstein, Moving Grids into the IPv6 Era, Grid and Cooperative Computing 2003, 7-10 December 2003, Shanghai, China.
  • P. Kirstein, K. Carlsberg, K. Hasler, P. O'Hanlon, Media Transmission Over Coupled Wired/Wireless Networks Using Application Level Active IPv6 Networks, Proc. 6th Int. Symp Comm. Networking, Perth, 13-16 October 2002, pp 195-207.
  • P. Kirstein, P. O'Hanlon, K. Carlberg, P. Gevros, K. Hasler, The RadioActive Networking Architecture, DANCE 2002, 29-30 May 2002, Grand Hyatt, San Francisco, USA. ISBN:0-7695-1564-9 pp.394-408.
  • Hermann de Meer, Piers O'Hanlon, Segmented Adaptation of Traffic aggregates, IWQOS 2001, June 6-8, 2001 in Karlsruhe, Germany. LNCS 2092, pp.342-353. ISBN: 3-540-42217-X
  • D. G. Jameson, M. Hobsley, P. O'Hanlon, S. Buckton, Experiences in Interactive Teaching in Distance Medical Education using an ATM Video Network, Proceedings of Eurochinatel Conference, April 1997, Beijing, China.
  • D.G. Jameson, M. Hobsley, P. O'Hanlon, S. Buckton, The Interactive Surgical Teaching from Remote Centres (INSURRECT) project, VII International Conference on Technology and Distance Education in San Jose, Costa Rica, 19-22 November, 1996
  • D.G. Jameson, M. Hobsley, P. O'Hanlon, S. Buckton, Surgical Teaching project in Surgery, ED-MEDIA 94, World Conference on Educational Multimedia and Hypermedia, June 25-29, 1994, Vancouver, Canada
  • E. Duval, H. Olivié, P. O'Hanlon, and D. Jameson, Networked hypermedia for education, Proceedings of Telematics for Education and Training (P. Held and W. Kugemann, eds.), Proceedings of the Telematics for Education and Training Conference, 1994, pp. 408-415
  • E. Duval, H. Olivié, P. O'Hanlon, D. Jameson, N. Ismail, S. Wilbur, and R. Beckwith, A multimedia information resource for education, Proceedings of the Eleventh International Conference on Technology and Education - London, England, 27-30 March 1994 (T. M. Thomas, ed.), pp. 1008-1010
  • E. Duval, I. Decloedt, C. Liekens, H. Olivié, P. O'Hanlon, D. Jameson, N. Ismail, S. Wilbur, J. Van Heddegem, and R. Beckwith, An Information and Telecommunication Infrastructure for Flexible and Distance Learning, Proceedings of Applica93, Telepresence, First International Conference on Technologies and Theories for Human Cooperation, Collaboration, Coordination, Lille, France, 22-24 March 1993, pp. 218-230
  • D. Jameson, P. O'Hanlon, R. Beckwith, E. Duval, and H. Olivié, Functionality of a Multi-media Image Network for Medical Education, Proceedings of Applica93, Telepresence, First International Conference on Technologies and Theories for Human Cooperation, Collaboration, Coordination, Lille, France, 22-24 March 1993, pp. 58-66
  • D. Jameson, P. O'Hanlon, R. Beckwith, E. Duval, and H. Olivié, Distance learning by satellite - using an information resource to provide a flexible learning system, Proceedings of Teleteaching: Proceedings of the IFIP TC3 Third Teleteaching Conference, Teleteaching 93 (Trondheim, Norway, 20-25 August , 1993) (G. Davies and B. Samways, eds.), pp. 459-467

Articles in international reviewed journals

  • M. Hobsley, R. Mccloy, D. G. Jameson, S. Buckton, P. O'Hanlon, Lessons learned during the INSURRECT project INteractive SURgical Teaching at REmote CeNtres,Journal of Telemedicine and Telecare, Volume 3 Number 1 Supplement June 1997, pp.38.
  • D.G. Jameson, P. O'Hanlon, S. Buckton, M. Hobsley, Broadband telemedicine: teaching on the information superhighway, Journal of Telemedicine and Telecare 1995; Volume 1 Number 2, pp.111-6.
  • E. Duval, H. Olivié, P. O'Hanlon, and D. Jameson, HOME: an environment for hypermedia objects, The Journal of Universal Computer Science 1 (1995), no. 5, 265-287
  • E. Duval, H. Olivié, P. O'Hanlon, D. Jameson, N. Ismail, S. Wilbur, and R. Beckwith, Managing networked multimedia data, ACM SIGGRAPH Computer Graphics 28 (1994), no. 1, 15-19

Contributions at international conferences, not published or only as abstract

  • E. Duval, P. O'Hanlon, and N. Ismail, Distributed Hypermedia for Education, Workshop at MediaActive 94, Harnessing Multimedia for Higher Education, Liverpool, United Kingdom, 4-6 May, 1994
  • R. Beckwith, D. Jameson, P. O'Hanlon, and E. Duval, Interactive Satellite Teaching and Conferencing Using an Image Server, ESA Olympus Conference, Seville, Spain 1993.

Invited Talks

  • P. O'Hanlon, S.Jiang, P.Kirstein, Grid and IPv6, INET2004, Barcelona.
  • P. O'Hanlon, Active Networks and Conferencing, First Internet Bay Conference on Science and the Cyber Community, Lulea, Sweden 2001
  • P. O'Hanlon, Secure Conferencing, Netproject.com Security seminars, London 2001

I enjoy various things including travel - especially to weird places. If you're interested in staying in Lisbon, then then try one of these flats. Here's my brother Austen's Art site (which I put together).

I have been involved with the Dancemachine - A live interact multichannel Audio and Video Art installation which debuted in Tate Britain and since has toured to Geneva and Dublin. The concept was conceived by Guy Baramotz, whilst I designed and built the core hardware and software.

See my problems and answers page (old) for awkward tech stuff that I've run into - basically timesinkers.

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