She joins the magazine publisher from Magnum Photos' Magnum in Motion where she was a multimedia producer responsible for producing podcasts and video essays.
In her new role, Dunn will cover all aspects of online video and multimedia storytelling for Elleuk.com and Sugarscape.com, oversee the launch of new editorial products and look to grow the audience for Elle TV.
"My first big challenge will be making sure that we are using the right player for our needs," Dunn told Journalism.co.uk.
"There are a lot of different video streaming options out there and I think it's vital that we have all HD and fullscreen options."
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