Mr Brown, a vegan, is a member of the Vestey family, which made about £750 million from wholesale of meat. He was educated at Radley College.
He was involved in anti-roads protests in the Nineties and last year forced Shell to abandon sponsorship of the Wildlife Photographer of the Year show.
He was a founder of London Rising Tide and has been active in Greenpeace as well as Friends of the Earth.
Amelia Gregory
She grew up in Herne Hill, and lives in Brick Lane. Ms Gregory, who also designs the stickers, posters and flags for the camp, studied textile design at Brighton University.
Ms Gregory was a stylist, writer and photographer before founding Amelia's Magazine and website six years ago, promoting ethical fashion and lifestyle. She said: "I think it's brilliant to see so many new faces here this year."
Kevin Smith
Mr Smith became a central figure in the media team because he said they were "caught by surprise" by Climate Camp's media attention at Heathrow.
This year, he said, the group wanted to "engage and get our message across" and that organisers found it frustrating that so much focus had been on policing.
Natalie Chambers
Miss Chambers, who grew up in the US, was arrested at the Plane Stupid protest at Stansted last December. "It was a scary step to take and not one I thought I'd take, but at certain times these kinds of actions are necessary and now is one of them for climate change." She works for an education charity in Cambridge, and "facilitates" Climate Camp meetings in her spare time.
Emily James
From California, Ms James studied at the National Film and Television School. At Blackheath she is training others to film the work of the camp for website Climate Camp TV. Ms James, who lives in Hackney, said: "My job is to amplify the message of the camp."
