Career
Dennen co-founded the mobile blogging platform Moblog, formerly MoblogUK, in November 2003. Commercial users of the service have included Ronan Keating, Bloc Party, Greenpeace, Elbow, Imogen Heap, Max Clifford, Channel 4, Oxfam, Amnesty International and Comic Relief. The service gained prominence in 2005 when Eliot Ward uploaded a photo to the site from one of the London Underground bombings.
Dennen responded to the terrorist attacks on London"s public transport system by creating the website We"re Not Afraid.
The site"s message was one of a public uniting against terrorism by refusing to sacrifice freedom in response to fear. Within days of the bombings, around 3,500 images had been submitted to the site.
The site was the subject of a British Broadcasting Corporation documentary and coverage included Sky News, Channel 5, American Broadcasting Company"s World News Tonight and the New York Times. Dennen"s Stopped Clocks project attempts to collate images of stopped public clocks and campaign to get them working again.
The campaign has featured on British Broadcasting Corporation News, London Tonight and The One Show.
In 2008, Dennen launched two art projects involving the creation of map-based images using mobile photography and Global Positioning System tracking. The first, in October 2008, was a treasure hunt around London to find photographs by James Nachtwey. Run in conjunction with the think tank Demos and XDRTB.org, the competition raised awareness of XDRTB. The second project, Britglyph, invited people from across the United Kingdom to build a nationwide geoglyph, placing rocks at specific locations around the country and uploading photos of themselves doing southern
The image was based on John Harrison"s Chronometer.
On 31 August 2012 Dennen re-launched the Big Art Mob project and was given control of the project from previous administrators Channel 4. The Big Art Mob in its new incarnation shifted focus from mapping the United Kingdom"s Public Art to mapping the whole world"son