Carl Pope is the former Executive Director of the Sierra Club, an American environmental organization founded by conservationist John Muir in 1892. Pope was appointed to his position as Executive Director in 1992, and served until January 20, 2010, when he was succeeded by Michael Brune. Pope then served as chairman of the Sierra Club until stepping down from that position in November 2011.

Pope had worked with the Sierra Club for more than 30 years, and has served as a board member for other organizations, including the National Clean Air Coalition, California Common Cause, and Public Interest Economics Inc. He has served as Political Director for Zero Population Growth. He was a Peace Corps volunteer in India from 1967 to 1969.

Pope is a regular contributor to the Huffington Post, a progressive website founded by Arianna Huffington.

In 2004 he published a book with Paul Rauber called Strategic Ignorance: Why the Bush Administration Is Recklessly Destroying a Century of Environmental Progress.

Anthony Kapel "Van" Jones (born September 20, 1968) is an American environmental advocate, civil rights activist, and attorney. Jones is a co-founder of three non-profit organizations. In 1996, he founded the Ella Baker Center for Human Rights, a California non-governmental organization (NGO) working for alternatives to violence. In 2005, he co-founded Color of Change, an advocacy group for African Americans. In 2007, he founded Green For All, a national NGO dedicated to "building an inclusive green economy strong enough to lift people out of poverty." His first book, The Green Collar Economy, was released on October 7, 2008, and reached number 12 on the New York Times Best Seller list. In 2008, Time magazine named Jones one of its "Heroes of the Environment".Fast Company called him one of the "12 Most Creative Minds of 2008".

In March 2009 Jones was appointed by President Barack Obama to the newly created position of Special Advisor for Green Jobs, Enterprise and Innovation at the White House Council on Environmental Quality, where he worked with various "agencies and departments to advance the administration's climate and energy initiatives, with a special focus on improving vulnerable communities." In July 2009 he became "embroiled in a controversy" over his past political activities, including a public comment disparaging congressional Republicans, his name appearing on a petition for 911Truth.org, and allegations of association with a Marxist group during the 1990s. For these issues, Van Jones was heavily criticized by conservatives. Jones resigned from the position in early September 2009. "On the eve of historic fights for health care and clean energy, opponents of reform have mounted a vicious smear campaign against me," Jones said in his resignation statement. "They are using lies and distortions to distract and divide."

Arianna Huffington (formerly Stassinopoulos; born Greek: Αριάννα Στασινοπούλου, July 15, 1950) is a Greek-born American author and syndicated columnist. She is best known for her liberal news website The Huffington Post. A popular conservative commentator in the mid-1990s, she adopted liberal political beliefs in the late 1990s. She is the ex-wife of former Republican congressman Michael Huffington.

In 2003, she ran as an independent candidate for Governor in the California recall election.

In 2009, Huffington was named as number 12 in Forbes' first-ever list of the Most Influential Women In Media. She has also moved up to number 42 in The Guardian's Top 100 in Media List.

In 2011, AOL acquired The Huffington Post for US$315 million and made Huffington president and editor in chief of The Huffington Post Media Group, which included The Huffington Post and then-existing AOL properties such as Engadget, AOL Music, Patch Media, and StyleList.

Huffington was born Arianna Stasinopoúlou in Athens, Greece, the daughter of Konstantinos (a journalist and management consultant) and Elli (née Georgiadi) Stasinopoulos, and is the sister of Agapi (an author, speaker and performer).^{[citation needed]} She moved to England at the age of 16, and studied economics at Girton College, Cambridge, where she was President of the Cambridge Union.

Gidon Bromberg (born November 26, 1963) is the Israeli Director of EcoPeace / Friends of the Earth Middle East (FoEME). FoEME is a regional organization that brings together Jordanian, Palestinian and Israeli environmentalists to promote sustainable development and advance peace efforts in the Middle East. It has offices in Amman, Bethlehem and Tel Aviv, employs 40 paid staff and actively involves hundreds of volunteers.

Bromberg founded the organization under the name of EcoPeace in 1994 and has been the Israeli Director ever since. In 1997, he led the entry of the organization into Friends of the Earth International, the largest grassroots environmental organization in the world. He has spearheaded the organization's advocacy campaigns both in Israel and internationally. He developed its particularly notable cross-border community peace-building project "Good Water Neighbors", which is now seen as a model for other programs in conflict areas.

Bromberg speaks regularly on water, peace and security issues in various forums. He has presented before the UN Commission for Sustainable Development, the United States House Committee on Foreign Affairs, the European Parliament and the advisory meeting to the UN High Level Panel on Security. He is a member of the Israeli Inter-Ministerial Committee on the Future of the Dead Sea, of the Israel UNESCO World Heritage Committee and the Inter-Ministerial Committee for Sustainable Development in Israel. In 2007, Mr. Bromberg was invited to join the EastWest Institute's International Task Force for Preventive Diplomacy. Most recently, he was selected for the 2007 World Fellowship at Yale University on global leadership.