“We are awed by our friend Warren Buffett’s decision to use his fortune to address the world's most challenging inequities, and we are humbled that he has chosen to direct a large portion of it to the Bill & Melinda Gates Foundation.

Over the past 15 years, we have enjoyed a special friendship with Warren, and his advice has had a major influence on us. Warren has not only an amazing intellect but also a strong sense of justice. Warren’s wisdom will help us do a better job and make it more fun at the same time.

The impact of Warren’s generosity will not be fully understood for decades. As we move forward with the work, we do so with a profound sense of responsibility. Working with Warren and with our partners around the world, we have a tremendous opportunity to make a positive difference in people’s lives.”

Read more about the announcement on Fortune.com.

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Bill & Melinda Gates Foundation
Guided by the belief that every life has equal value, the Bill & Melinda Gates Foundation works to help all people lead healthy, productive lives. In developing countries, it focuses on improving people's health and giving them the chance to lift themselves out of hunger and extreme poverty. In the United States, it seeks to ensure that all people—especially those with the fewest resources—have access to the opportunities they need to succeed in school and life. Based in Seattle, the foundation is led by CEO Patty Stonesifer and co-chair William H. Gates Sr., under the direction of Bill and Melinda Gates and Warren Buffett.