Nicholas D. Kristof is a New York Times op-ed columnist and two-time Pulitzer Prize winner. With his wife, Sheryl WuDunn, he has written four best-selling books, including the No. 1 New York Times best-seller "Half the Sky." Kristof and WuDunn were the first married couple to win a Pulitzer for journalism, for their coverage of the Tiananmen Square democracy movement in China and the massacre that followed. Kristof later won a second for his columns from Darfur. Kristof and WuDunn live in the New York area with their three children.

Kristof is active on social media, particularly Facebook (www.facebook.com/kristof) and Twitter (www.twitter.com/nickkristof). He was the first blogger on the New York Times website and the first to make a video for the site; he now has more Twitter followers than any other print journalist.

Sheryl WuDunn is a Chinese American business executive, author, and lecturer who was the first Asian-American to win a Pulitzer Prize.

A senior banker focusing on growth companies in technology, new media and the emerging markets, WuDunn also works with double bottom line firms, alternative energy issues, and women entrepreneurs. She has also been a private wealth adviser with Goldman Sachs and was previously a journalist and business executive for The New York Times. She is now senior managing director at Mid-Market Securities [1] , a boutique investment banking firm in New York serving small and medium companies.

At the Times, WuDunn ran coverage of global energy, global markets, foreign technology and foreign industry. She oversaw international business topics ranging from China's economic growth to technology in Japan, from oil and gas in Russia to alternative energy in Brazil. She was also anchor of The New York Times Page One, a nightly program of the next day's stories in the Times. She also worked in the Times's Strategic Planning Department and in the Circulation Department, where she ran the effort to build the next generation of readers for the newspaper. She was one of the few people at The Times who went back and forth between the news and business sides of the organization.

She earlier was a foreign correspondent in The New York Times Beijing and Tokyo bureaus, and speaks Chinese and Japanese. While in Asia, she also reported from other areas, including North Korea, Australia, Burma and the Philippines. WuDunn, recipient of an honorary doctorate from Middlebury College, will be a senior lecturer at Yale University's Jackson Institute for Global Affairs in the fall of 2011. She is a commentator on China and global affairs on television and radio shows, including NPR, Colbert Report and Charlie Rose.