New York (CNN) — OpenAI CEO Sam Altman and his husband are the most recent billionaires to sign the Giving Pledge, a charity that encourages the super-rich to donate their wealth to charity.

“All we can do is express our deep gratitude, commit to paying it forward, and do everything we can to build the scaffolding a little higher,” they said.

Bloomberg reports that Altman, 39, is value no less than $2 billion. Much of his wealth comes from investments in startups, including a large investment in Reddit. He owns no shares in OpenAI, the technology company that leads the sector of artificial intelligence.

Altman and Mulherin live in San Francisco and reportedly also own homes in Napa Valley and Hawaii. They married in January.

The Giving Pledge was launched in 2010 by billionaires Warren Buffett and former couple Bill and Melinda French Gates to encourage the world's richest people to commit to donating no less than half of their wealth to charitable and philanthropic causes either during their lifetime or of their will.

The pledge isn’t a legally binding contract, but somewhat an ethical commitment. The intention of the campaign is to “stimulate conversations, discussions and actions, not only about how much [to give] but also for what purposes and with what aim,” said website.

Currently, over 245 couples and individuals from 30 countries have registered.

On Tuesday, French Gates, one in all the richest and most famous philanthropists on this planet, announced that she Donate $1 billion by 2026 to work along with her organization Pivotal Ventures to advertise women’s rights worldwide.

Earlier this month, she resigned from the Bill & Melinda Gates Foundation following her divorce from Bill. As a part of her Divorce agreementAfter her resignation, she received $12.5 billion from the Gates Foundation for her work.

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