Twitter Activity Animations

7 days of Twitter data superimposed into 24 hours.

Geo located tweets are shown as yellow circles that fade away by time, and re-tweets are shown as small yellow points moving onto a line connecting the location of the original tweet and the geo-location of the re-tweeter.

In collaboration with Fabian Neuhaus and Steven Gray.




2014: Business and Innovation Award (Crowd Vision Ltd) - Royal Borough of Greenwich Civic Awards, UK


2011: Award received from H. R. H. Prince Dr Mansour bin Miteb bin Abdul Aziz Al Saud, Riyadh, Kingdom of Saudi Arabia


Crowded Places Idea Award 2008, Global Security Challenge, London, UK



2007: Distinction from H. R. H. Prince Miteb bin Abdul Aziz Al Saud, Riyadh, Kingdom of Saudi Arabia









Keynote and Invited talks

  1. WHO expert meeting, Crowd crush, control, and management, Riyadh, Kingdom of Saudi Arabia, 29 April 2013
  2. Saudi Exhibition and Symposium for Building Industries and Technology, Real-time crowd analytics during the Hajj, Jeddah, Kingdom of Saudi Arabia, 25 September 2012
  3. Workshop on Populations & Crowds: Dynamics, Disruptions and their Computational Models, Populations and Crowds: Evolutionary Dynamics of Multiscale Human Mobility, Los Angeles, USA, 7 September 2012
  4. Operation of Jamarat & Makkah Metro for Hajj Season 1433H, Real-time crowd monitoring and counting system at Makkah Metro, Jeddah, Kingdom of Saudi Arabia, 30 July 2012
  5. Urban Transport Systems Laboratory (LUTS) Seminar, Multiscale Human Mobility: From Micro Mechanisms to Macro Behaviour, EPFL, Lausanne, Switzerland, 16 May 2012
  6. CABDyN Seminar, Multiscale Human Mobility: From Micro Mechanisms to Macro Behaviour, University of Oxford, UK, 8 May 2012
  7. Centre for Transport Studies (CTS) Research Seminar, Multiscale Human Mobility: Towards Smarter Transport, Imperial College London, UK, 2 May 2012
  8. University of Bristol Bristol Centre for Complexity Sciences (BCCS), Multiscale Human Mobility, Bristol, UK, 24 April 2012
  9. FuturICT - Smart Mobility in The Information Age, Mobility and Crowds, Zurich, Switzerland, 23 April 2012
  10. Social Mechanism Seminar, Institute for Futures Studies, Multiscale Human Mobility, Stockholm, Sweden, 23 March 2012
  11. Workshop on the Operation of AlMashaaer Makkah Metro for Hajj Season 1433H, Crowd Motoring and Counting System, Riyadh, Kingdom of Saudi Arabia, 6 February 2012
  12. UoM Complex Systems and Statistical Physics Seminars, Multi-Scale Mobility: The Interplay of Supply and Demand of Space and Time, University of Manchester, 16 November 2011
  13. EngD System Research Conference, Multi-Scale Mobility: The Interplay of Supply and Demand of Space and Time, Bristol, UK, 12 October 2011
  14. Workshop for Operation of AlMashaaer Makkah Metro for Hajj Season 1432H, Crowd Monitoring and Counting System, Jeddah, Kingdom of Saudi Arabia, 15 August 2011

  15. International Workshop on Coping with Crises in Complex Socio-Economic Systems, Human mobility across scales - applications to energy and health, Zurich, Switzerland, 24 June 2011 [www]

  16. First Workshop for Planning the Operation of Jamarat Building for Hajj 1432H, Pilgrim-Flow Measurements in Jamarat Area during Hajj 1431H, Riyadh, Kingdom of Saudi Arabia, 19 January 2011 [www]

  17. Complexity Science seminar series, Imperial College London, Tracking and modeling urban mobility, London, UK, 7 December 2010 [www]

  18. The Lancet Conference on Mass Gathering Medicine, Crowd Management and Control: Preventing Crowd Disasters During the Hajj, Jeddah, Kingdom of Saudi Arabia, 25 October 2010

  19. Research Center on Animal Cognition, Universite Paul Sabatier, Toulouse, France, 5 October 2010 [www]

  20. PTV User Group Meeting, Pedestrian Crowd Modeling, London, UK, 22 April 2010

  21. Structural Engineering Expert Meeting, Crowd Management, Dubai, United Arab Emirates, 31 January 2010

  22. Lecture at ABB, From Pedestrian Flows to Panicking Crowds, Baden, Switzerland, 21 January 2010

  23. Lecture at ZHAW, Simulating the Dynamics of Pedestrian Crowds, Winterthur, Switzerland, 8 December 2009

  24. Jamarat Workshop, Tools for Pilgrim Analysis in the Jamarat Area During the Hajj in 1430H, Jeddah, Kingdom of Saudi Arabia, 9 November 2009

  25. DECOI 2009, International workshop on collective intelligence and evolution, Simulating the Dynamics of Human Crowds, Leiden, the Netherlands, 23 February 2009

  26. First Workshop for Planning the Operation of the Modern Jamarat Building for Hajj 1430H, Results of Pilgrims Flow in Jamarat Area During the Hajj in 1429H, Riyadh, Kingdom of Saudi Arabia, 18 February 2009

  27. Global Security Challenge, Crowd Vision, London, UK, 13 December 2008

  28. International Workshop on Challenges and Visions in the Social Sciences, Tutorial: Simulating the Dynamics of Human Crowds, Zurich, Switzerland, 19 August 2008

  29. Graduiertenkolleg Automatismen, Universität Paderborn, Self-organization and (in-)coordination in human crowds, Paderborn, Germany, 15 July 2008

  30. THALES workshop, Analyzing the Pilgrim Flows during the Hajj, Paris, France, 21 May 2008

  31. PTV AG, The Dynamics of Crowd Disasters, Karlsruhe, Germany, 16 April 2008

  32. Safety First - Dealing with Disasters, TU Delft, The Dynamics of Crowd Disasters, Delft, The Netherlands, 13 March 2008

  33. Jamarat Workshop, Pilgrims-Flow Measurements in Jamarat Area during Hajj 1428H, Riyadh, Kingdom of Saudi-Arabia, 24 February 2008

  34. THALES workshop, Video Tracking of Pedestrians, Paris, France, 7 February 2008

  35. General Workshop for Hajj 1428H: Applications in Jamarat Area & Bridge, Results of Pilgrims Flow in Jamarat Area in Hajj 1427H, Jeddah, Kingdom of Saudi-Arabia, 5 November 2007

  36. Colloquium: Selected Challenges in the Social Sciences: Modeling and Simulation Approaches, Computer Simulation of Pedestrian Interactions and Crowd Dynamics, Zurich, Switzerland, 2 October 2007

  37. Jamarat Workshop, Video-Analysis Software, Riyadh, Kingdom of Saudi-Arabia, 2 July 2007

  38. Jamarat Workshop, Real-Time Analysis of Video Recordings of Dense Crowds, Riyadh, Kingdom of Saudi-Arabia, 26 February 2007

  39. Talk for Prince Miteb with staff, Minister of Municipal and Rural Affairs, Kingdom of Saudi Arabia, Analysis and Evaluation of Video Recordings of Dense Crowds, Riyadh, Kingdom of Saudi-Arabia, 8 January 2007

  40. Jamarat Workshop, Analysis and Evaluation of Video Recordings of Dense Crowds, Jeddah, Kingdom of Saudi-Arabia, 26 November 2006

  41. Workshop on Management and Safety of Human Crowds During Hajj Rituals in Jamarat Area, Analysis and Evaluation of Video Recordings of Dense Crowds, Riyadh, Kingdom of Saudi-Arabia, 6 February 2006

  42. Ministry of Hajj, Simulation of Pedestrian Crowds - Basic Rules, Mecca, Kingdom of Saudi-Arabia, 7 January 2006

  43. Ministry of Hajj, Large-scale, complex simulations & video analysis, Application of Jamarat Bridge, Mecca, Kingdom of Saudi-Arabia, 7 January 2006

  44. German-Saudi Expert Meeting on Simulation, Management, and Safety of Human Crowds, Simulation of Pedestrian Crowds, Dresden, Germany, 27 September 2005

Conference, Workshop and Seminar talks

  1. Networks Seminar, Collective behaviour and self-organisation of human mobilityDepartment of Mathematical Sciences, Bath, UK, 14 March 2013
  2. CASA Seminar, An Ode to Mathematical Modelling in a Data Rich World, UCL, London, UK, 20 February 2013
  3. Applied Nonlinear Mathematics Seminar, An Ode to Mathematical Modelling in a Data Rich World, Bristol, UK, 1 March 2013
  4. Department of Biochemistry, Self-organised Human Mobility and Bio-inspired Design Solutions, University of Bristol, UK, 14 September 2012

  5. EpiNets Symposium, Modeling of Disease Spreading in Crowds, Bristol, UK, 17 July 2012

  6. PED (Pedestrian and Evacuation Dynamics) 2012, Utilizing Crowd Insights to Refine Disease-Spreading Models, ETH Zurich, Switzerland, 8 June 2012

  7. Applied Urban Modelling: Assessing Pathways Towards Energy Efficient and Climate-Wise City Regions (AUM2012), Urban Multi-Scale Agent-Based Modelling: With Applications to Energy, Health, Safety, and Efficiency, University of Cambridge, UK, 25 May 2012

  8. Systems Seminar Series, A Roadmap to Smart Transport, Bristol, UK, 28 March 2012

  9. Department of Archaeology and Anthropology, Multiscale Human Mobility, University of Bristol, UK, 14 March 2012

  10. ECCS European Conference on Complex Systems, Complexity-NET session, Complexity in Spatial Dynamics (COSMIC), Vienna, Austria, 15 September 2011

  11. ECTN 2011 Workshop: Evolution of Complex Transportation Networks, Urban Transport - From Micro Navigation Heuristics to Macro Congestion Patterns, University of Strathclyde, UK, 30 August 2011

  12. CASA seminar series, Pedestrian modelling across scales -- From Micro Mechanisms to Macro Behaviour, London, UK, 2 February 2011

  13. CASA seminar series, Urban Transport Modeling - Applications to Safety, Energy Consumption and Epidemics Spreading, London, UK, 20 October 2010

  14. Future Research Directions in Agent Based Modelling, Urban Mobility: A Data-Driven Approach, Leeds, UK, 16 June 2010

  15. Goldrain Workshop, Smart Cameras in Urban Environments, Goldrain, Italy, 11 September 2009

  16. Traffic and Granular Flow 2009, Analysis of High Density Pedestrian Crowd Data and Implications for Crowd Safety, Shanghai, China, 22 June 2009

  17. Goldrain Workshop, Pedestrian Simulation: Beyond Particles, Goldrain, Italy, 20 June 2008

  18. Pedestrian and Evacuation Dynamics 2008, Analysis of Empirical Trajectory Data of Pedestrians, Wuppertal, Germany, 27 February 2008

  19. Fourth Conference of the European Social Simulation Association ESSA, Quantitative Agent-Based Modeling of Human Interactions in Space and Time, Toulouse, France, 14 September 2007

  20. Goldrain Workshop, Extraction of Microscopic Properties from Trajectory Data, Goldrain, Italy, 20 September 2006




Popular science books featuring my work

  1. Flow: Nature's patterns: a tapestry in three parts, Philip Ball, 2009 [www]
  2. The Perfect Swarm, Len Fisher, 2010 [www]
  3. Smart Swarm: Using Animal Behaviour to Organise Our World, Peter Miller, 2011 [www]
  4. Informotion, Tim Finke & Sebastian Manger, 2012 [www]
  5. Why Society is a Complex Matter, Philip Ball, 2012 [www]


  1. Aiming for a disease-free Olympics, by Hugh Wilson (9 June 2012), The Australian [www]
  2. Os riscos das multidões: A ajuda da tecnologia [The risks of crowds: The help of technology], by Thais de Luna (31 January 2012) Correio Braziliense [in Portugese]
  3. Computer models that predict crowd behaviour could be used to prevent the spread of infections at mass gatherings, 16 January 2012, myScience [www]
  4. How to stop stampedes: Lessons for India, 23 November 2011, ZeeNews [www]
  5. Now, software to prevent stampedes, 4 August 2011, The Hindu [www]
  6. Anders Johansson about London's tweets, by Swantje Diepenhorst, 23 May 2011, 2010LAB [www]
  7. What Causes Deadly 'Crowd-Quakes'?, by Dave Mosher, 22 April 2011, Science [www]
  8. Wie sicher sind Massenveranstaltungen in Zukunft?, by Yvonne Kuester et al, September 1 2010, Wunderwelt Wissen [in German] [pdf]
  9. Wie überlebt man eine Massenpanik?, by Christina Steinlein, July 26, 2010, Focus Online [in German] [www]
  10. Wer hilft, riskiert sein Leben, by Clemens Schömann-Finck, July 25, 1010, Focus Online [in German] [www]
  11. Warum die Wege des Menschen unberechenbar sind, by Holger Dambeck (June 7, 2010), Spiegel Online [in German]
  12. Mobilität - Schwarmwesen Mensch, by Reto Aschwanden (April 1, 2010), Surprise [in German]
  13. Europäer weichen lieber nach rechts aus (February 24, 2010), Presstext [in German]
  14. Total vernetzt, by Max Rauner (December 9, 2009) Zeit Wissen 1, 28-36 [in German]
  15. Leben in der Masse, by Philipp Crone (May 27, 2009), Süddeutsche Zeitung [in German]
  16. Massen in Panik (March 28, 2009), Salzburger Nachrichten [in German]
  17. How Officials will Control the Crowds at Obama’s Inauguration, by Philip Taylor (January 20, 2009), Popular Mechanics
  18. Fußgängerstrome von Ptv simuliert (June 23, 2008), ka-news [in German]
  19. Mekka als Praxistest, (2/2008) PTV Compass [in German]
  20. German researchers help keep pilgrims safe at the Hajj (20 December 2007), Young Germany
  21. Einbahnstrasse zum Hadsch, by Max Rauner (11 November 2007) sonntagsZeitung [in German]
  22. Panic Specialists Bring Order to the Hajj, by Max Rauner (October 25, 2007), Spiegel
  23. Smart att vara flockdjur pa flygplatsen (14 October, 2008), Illustrerad Vetenskap [in Swedish]
  24. Nur keine Panik, by Max Rauner (October 22, 2007) Zeit Wissen [in German]
  25. ’Crowd quakes’ could be predicted by CCTV analysis, by David Robson (September 13, 2007), NewScientistTech
  26. CCTV Technology News & Society, by Lin Freestone (13 September, 2007), cctv core
  27. CCTV Can Offer Early Warning of Crowd Panic Problems, by Sherry Harowitz (September 7, 2007), Security Management
  28. Crowd control: the dynamic of panic, by Rembert Unterstell (July 9, 2007), Canberra Times
  29. La folla in laboratorio (Crowd in a laboratory), (June 25, 2007) Focus [in Italian]
  30. Crowd turbulence: the physics of crowd disasters (May 22, 2007), IOP
  31. Wie von Geisterhand gesteuert, by Kerstin Viering (May 11, 2007), Berliner Zeitung [in German]
  32. Modeling Mecca’s Crowd, by Constance Holden (April 20, 2007), Science 316
  33. Formula for Panic: Crowd-motion findings may prevent stampedes, by David Caselvecchi (April 7, 2007), Science News 171, 14
  34. Massenpanik in Mekka, by Jakob Kneser (3 April, 2007), Quarks&Co, WDR [in German]
  35. Weniger Gefahr bei der ”Steinigung des Teufels”, by Markus Christen (February 18, 2007), NZZ [in German]
  36. Biztonsgos haddzs, (February 8, 2007), Figyel [in Hungarian]
  37. Un anno fa la strage di pellegrini alla Mecca Ora la matematica prova a salvare i fedeli, by Piattelli Palmarini Massimo (February 5, 2007), Corriere della Sera [in Italian]
  38. Safety on the Jamarat Bridge, by Adam Rogers (January 22, 2007), Wired Science, (http://blog.wired.com/wiredscience/2007/01/safety_on_the_j.html)
  39. Crowd researchers make pilgrimage safer, by Philip Ball (January 19, 2007), Nature
  40. La menace terroriste, source de panique, by Olivier Mouton (October 1, 2005), Lalibre [in Italian]
  41. Menschenmassen, by Stephan Schön (January 24, 2005), Schsische Zeitung Dresden, title page [in German]
  42. Perspektiven der aktuellen Fußganger- und “Panik”-Forschung (20 January 2005), innovations report [in German]

TV interviews / appearances

  1. Bang Goes the Theory, BBC One (2 April 2012), UK [www]
  2. The science 'X Factor' with a 1bn euro prize (20 May 2011), BBC, UK [www]
  3. Revealed, The Hajj, (December 16, 2007), Discovery Channel
  4. Pilgrims crowds (November, 2007), Channel 2, Kingdom of Saudi Arabia
  5. Massenpanik in Mekka, (April 10, 2007), Quarks&Co, WDR, Germany [in German]
  6. Don’t Panic (March 29, 2005), MDR Sachsenspiegel, Germany [in German]

Radio interviews

  1. The Global Lab Podcast (23 November 2011) [www]
  2. “The Hajj” (29 March, 2008), DRS, Switzerland [in German]



Current doctoral students

  1. Lara Gosce (PhD Civil Engineering, 2012--2015), 'Modelling human mobility in the context of disease spreading', co-supervised with David Barton
  2. Barry Park (EngD Systems, 2010--2014), 'Human-Agent Collectives in the Defence & Security Domain', co-supervised with Mike Yearworth
  3. Dr David Greenwood (EngD Systems, 2012--2016), 'Next generation crowd flow simulation and visualisation
  4. Mark Hall (EngD Systems, 2012--2016), 'Applying systems thinking for situational understanding and collaborative working'
  5. Christos Ellinas (EngD Systems, 2012--2016), 'A complex systems approach to complex project risk management', co-supervised with Thilo Gross
  6. Bharat Kunwar (PhD Civil Engineering, 2012--2015), 'Crowd modelling for a crisis'
  7. Richard Simpson (EngD Systems, 2009--2013), 'Engineering a Navigation System in GPS Denied Environments', co-supervised with Arthur Richards
  8. Theodoros Spyridopoulos (PhD Computer Science, 2012--2015), 'Modelling and Simulations of Cyber-capability', co-supervised with Theo Tryfonas
  9. Bengt Cousins-Jenvey (EngD Systems, 2011--2015), 'Building for the 21st Century - a systems engineering approach to reduce whole life carbon emissions'), co-supervised with Pete Walker and Andy Shea
  10. Saraansh Dave (EngD Systems, 2010--2014), 'A Systems Approach to Smart Grids', co-supervised with Mike Yearworth

Upcoming Conferences (Programme Committe)

  1. First International Workshop on Pattern Recognition and Crowd Analysis, in conjunction with the ICPR 2012 conference, 11 November 2012, Tsukuba, Japan [www]
  2. Workshop on Technologies for the Organisation, Adaptation and Simulation of Transportation Systems, 14 September 2012, Lyon, France [www]
  3. 6th International Conference on Pedestrian and Evacuation Dynamics, Zurich, Switzerland, 6-8 June 2012 [www]
  4. 1st IEEE Workshop on Modeling, Simulation and Visual Analysis of Large Crowds, 6-13 November 2011, Barcelona, Spain [www]


Past and present research projects

FuturICT: The Knowledge Accelerator

SIMULACRA: Simulating Urban Land-use As Commercial and Residential Activity

Game Theory: Cooperation, Norms, Revolutions

Bio-inspired logistics: BioLogistics

Supplementary videos: Leadership, consensus decision making

The dynamics of crowd disasters

Crowd simulation with VISSIM

Simulation of dense crowds


Research trajectory

2012 - Systems Centre, University of Bristol
2010 - 2011 CASA, University College London
2007 - 2010   SOMS, ETH Zurich
2005 - 2007 Traffic Modeling, Dresden University of Technology

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