Cari Tuna

Cari Tuna is an American former journalist who, with her husband Dustin Moskovitz, directs the philanthropic apparatus that became the largest sustained funder of the Effective Altruism movement. She is the president of Good Ventures, the foundation she and Moskovitz established in 2011, and a leader of Open Philanthropy, the grantmaking organization that channels their Facebook-derived fortune toward global health, longtermism, and AI-safety work.¹²

From Journalism to Philanthropy

Tuna worked as a reporter for the Wall Street Journal before leaving to manage the couple's giving full time. She and Moskovitz, among the youngest signatories of the Giving Pledge, committed to donating the majority of their wealth, and they built Good Ventures and Open Philanthropy as the vehicles for doing so according to the evidence-and-reasoning methodology of effective altruism. Tuna became the public face of the operation, articulating its "give where it does the most good" framework.¹³

Tuna and Moskovitz married in 2013 and signed the Giving Pledge in 2014 in their late twenties and early thirties, among the youngest people to do so. Tuna serves as president of Good Ventures and chairs the board of the grantmaking organization, the legal and governance counterpart to the staff research that Holden Karnofsky and Alexander Berger ran. She has described the couple's decision to delegate cause selection to a professional staff applying cost-effectiveness analysis rather than directing the money toward causes of personal sentiment, the organizing principle that distinguished their approach from conventional billionaire philanthropy.¹³

Open Philanthropy

As a leader of Open Philanthropy, Tuna helped direct more than four billion dollars in grants across global health, scientific research, pandemic preparedness, farm-animal welfare, and the prevention of catastrophic risks from advanced artificial intelligence. The longtermist and AI-risk portion of that giving made Open Philanthropy the principal institutional patron of the AI-safety community around the Machine Intelligence Research Institute, the Future of Humanity Institute, and the AI company Anthropic, the durable counterpart to the short-lived FTX Future Fund of Sam Bankman-Fried.²⁴

The grantmaking arm rebranded as Coefficient Giving in November 2025, shifting toward multi-donor funds that other philanthropists could join, while Good Ventures remained the dominant source of its money. Tuna chairs the Good Ventures board that supplies that capital, leaving her with formal control over the largest single pool of effective-altruism funding even as professional staff make the grant decisions. The structure concentrated a substantial share of global AI-safety funding under one foundation, drawing criticism that the field examining the AI labs depended financially on a single donor couple who were also early investors in one of those labs.²⁴