The annual Social Good Summit, a unique convening of world leaders, new media and technology experts, grassroots activists and voices from around the world, today announced the initial roster of speakers for its 2015 Summit which will take place September 27 and 28 in New York. A unique mix of speakers will share their visions for the future including:  Kathy Calvin, President and Chief Executive Officer of the United Nations Foundation, Pete Cashmore, Founder and CEO of Mashable Helen Clark, Administrator of the United Nations Development Programme Richard Curtis, Director, Writer, Producer and Founder of Project Everyone, Adrian Grenier, Actor, Entrepreneur, Dell Social Good Advocate.

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