The pledge does not represent a legal commitment and does not set any conditions on how the donors distribute their money — or how soon. But some experts said the impact may be significant. “I think there’s going to be an immediate expectation for other billionaires to join them,” said Trevor Neilson of the Global Philanthropy Group, which advises wealthy individuals on giving away money. Neilson, who previously worked for the Gates foundation, called the announcement “a game-changer in the world of philanthropy.”

This article originally appeared in The San Jose Mercury News