Actress Sienna Miller, U.N. Messenger of Peace Charlize Theron Among New Social Good Summit Speakers

Actress Sienna Miller and U.N. Messenger of Peace Charlize Theron are among the newest speakers announced for Mashable‘s 2015 Social Good Summit.

Sienna Miller is an actress, activist and has served as Global Ambassador for International Medical Corps since 2009. She has visited International Medical Corps field programs in the Democratic Republic of Congo, Haiti, Ethiopia and Lebanon, to highlight the plight of the displaced and those most vulnerable in crisis and conflict zones. Due to her tireless advocacy with refugees, International Medical Corps honored her with its Global Activist Award in 2011.

As a U.N. Messenger of Peace, Academy Award-winning actress Charlize Theron focuses on the prevention of HIV and the elimination of violence against women. In 2007, she founded the Charlize Theron Africa Outreach Project to help African youth keep themselves safe from HIV. Since its inception, it has directly benefited more than 200,000 people in sub-Saharan Africa.

See also: More than 65 countries will virtually join the 2015 Social Good Summit

Miller and Theron join additional speakers including:

• Karen Appleton , Senior Vice President, Industries & Founder of Box.org
• Hugh Evans , CEO of The Global Poverty Project
• Bill Hoffman , Head of Data-Driven Development at World Economic Forum USA
• Kweku Mandela , Co-founder of Africa Rising Foundation
• David Rose , Product Designer, Serial Entrepreneur and MIT Media Lab Researcher
• Melissa Jun Rowley , Founder and CEO of Humanise, Inc.
• Susan Silbermann , President and General Manager of Pfizer Vaccines

They will take the stage with philanthropists, activists and thought leaders at the sixth annual Social Good Summit on Sept. 27 and 28 in New York City to discuss how people and communities are using digital tools to plan for a brighter future by the year 2030.

Together with our partners, including the United Nations Foundation, theUNDP and the 92nd Street Y, we’re poised and ready for the 2015 Social Good Summit to be bigger than ever.

Tickets are now available . Interested in covering the event? Apply here for a spot in our Digital Media Lounge. For more updates, including speaker announcements and ticket information, follow @MashableEvents on Twitter.

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About the United Nations Foundation
The United Nations Foundation builds public-private partnerships to address the world’s most pressing problems, and broadens support for the United Nations through advocacy and public outreach. Through innovative campaigns and initiatives, the Foundation connects people, ideas, and resources to help the UN solve global problems. The Foundation was created in 1998 as a U.S. public charity by entrepreneur and philanthropist Ted Turner and now is supported by global corporations, foundations, governments, and individuals. Learn more at www.unfoundation.org.