Gates and his wife invited Joan Salwen to Seattle to speak about what the family had done, and on December 9, 2010, Bill and Melinda Gates, and investor Warren Buffett signed a commitment they called the "Giving Pledge."
Gates dan istrinya mengundang Joan Salwen ke Seattle untuk membicarakan tentang hal-hal yang dilakukan oleh keluarga tersebut, dan pada 9 Desember 2010, Gates, investor Warren Buffett, dan Mark Zuckerberg (CEO Facebook) menandatangani janji yang mereka sebut "Gates-Buffet Giving Pledge".