In the early 2000s, Dustin Moskovitz helped build Facebook alongside Mark Zuckerberg, transforming the startup into a global tech empire. Now, he and his wife, former journalist Cari Tuna, are devoting their lives to giving their money away.

Tuna, 40, met Moskovitz, 41, in 2009, surviving on an entry-level journalist salary at The Wall Street Journal, where she covered enterprise tech and California’s economy. Moskovitz had a philanthropic mindset early on, and Tuna turned that vision into action.

Since then, the couple has donated more than $4 billion total, including more than $600 million in 2025 alone. Their goal is to donate as much as quickly as they can.

Moskovitz’s $10 billion fortune traces back to his early days at Facebook when he helped launch the platform with his then-roommate Zuckerberg in 2004. Today, Facebook’s parent company Meta is worth  $1.6 trillion. After Facebook, the cofounder went on to build his now-$3 billion project management platform Asana in 2008, where he recently stepped down as CEO.

Since 2011, Tuna has been chipping away at giving their wealth away, cofounding and becoming chair of Good Ventures, a philanthropic foundation. The couple has placed another $10 billion into the foundation.

To solidify their commitment to giving, the couple were among the first donors to sign Gates’ and Warren Buffett’s Giving Pledge in 2010 when Cari was 25, making her the youngest signatory in the Pledge’s history.

The Giving Pledge invites the world’s wealthiest individuals and families to publicly commit to giving away at least 50% of their wealth to philanthropy, either during their lifetimes or in their wills. Despite hundreds of billionaires signing the Giving Pledge, not all have followed through.

“We will donate and invest with both urgency and mindfulness, aiming to foster a safer, healthier and more economically empowered global community,” Moskovitz wrote when pledging his efforts in 2010.

After founding and chairing Good Ventures in 2011, Tuna guides the couple’s giving with Open Philanthropy, a funder and advisor that grew out of a partnership between GiveWell and Good Ventures and became independent in 2017.

Long before COVID-19 or ChatGPT’s takeover, Tuna was funding pandemic prevention and AI safety research. Their largest grants include at least $300 million to the Malaria Consortium, $200 million to Evidence Action, and $100 million to Helen Keller International, all chosen for measurable impact on public health.