Mark Tercek is president and CEO of The Nature Conservancy, the global conservation organization known for its intense focus on collaboration and getting things done for the benefit of people and nature.

A former managing director for Goldman Sachs, where he spent 25 years, Mark brings deep business experience to his role leading the Conservancy, which he joined in 2008. He is a champion of the idea of natural capital — valuing nature for its own sake as well as for the services it provides for people, such as clean air and water, productive soils and a stable climate. Mark’s forthcoming book, Nature’s Fortune: How Business and Society Thrive by Investing in Nature, which will be published by Basic Books this April, explores why responsible stewardship of nature is of the utmost importance to businesses, governments and societies.

Andrew Revkin, a prize-winning science reporter and author, has spent a quarter of a century covering subjects ranging from the assault on the Amazon to the Asian tsunami, from the troubled relationship of science and politics to climate change at the North Pole. Since 1995, he has been covering the environment for The New York Times, but his first prize-winning magazine articles on the human influence on climate were published more than 20 years ago, before the creation of the Intergovernmental Panel on Climate Change. He has written acclaimed books on the Amazon (1990), global warming (1992), and the changing Arctic (2006). His multimedia work on the Web has also been widely lauded, particularly his New York Times blog, Dot Earth. He is the first science reporter to win a John Chancellor Award for sustained excellence in journalism.

While the media largely ignored this building story until recently, Mr. Revkin continually covered the science and politics of global warming in more than 500 magazine and newspaper stories, two books, a prize-winning Discovery-Times documentary, Arctic Rush, and on his acclaimed New York Times blog, Dot Earth, created in October 2007. The blog has built a magazine-size audience (~400,000 monthly views). His reporting on the politic struggles over climate policy has consistently led all competitors. In 2005 and 2006, he exclusively exposed efforts by political appointees to rewrite government climate reports in the White House and prevent NASA scientists from conveying their views on warming. His stories were quickly followed by the resignations of two officials.

Andrew Revkin has been a pioneer in multimedia journalism, blogging, pod casting, and shooting still and video imagery in far-flung places. One of his pictures, of a scientist trudging in darkness and a blizzard on the North Slope, won an Award of Excellence in the Pictures of the Year International competition in 2005.