Dirk Edward Ziff
American billionaire
Source: Wikidata — retrieved 7/12/2026 (wikidata)
Profile Summary
Dirk Edward Ziff (born 1965) is an American billionaire with an estimated net worth of ~$7.2B. Wikidata
Philanthropy
ProPublica-reported IRS Form 990 filings for 2023 show three foundations associated with the Ziff name: Ziff Heritage Foundation (NY), Robert D Ziff Foundation (NY), and Harold And Libby Ziff Foundation (CA). ProPublica 990 Across these filings, total foundation assets were $4,340,971 and total grants paid were $0 in 2023. ProPublica 990 Individually, each foundation reported $0 grants paid in 2023 while reporting assets of $69,861 (Ziff Heritage Foundation), $1,626,877 (Robert D Ziff Foundation), and $2,644,233 (Harold And Libby Ziff Foundation). ProPublica 990
U.S. Presence
Philanthropy
Score Breakdown
The PBS is a weighted average of 2 components. The formula is open and versioned — the weight percentages below show how much each component contributes to the final score.
Evidenced charitable giving — built on what they actually give each year, not parked assets. Dominated by generosity (annual giving relative to net worth — the share of your fortune you give), plus the absolute scale of that giving, plus a small nudge for signing the Giving Pledge (a commitment, not a realized action).
Data: ProPublica 990 charitable disbursements, net worth, The Giving Pledge registry
How much sourced, public accountability data exists — net worth, political contributions, SEC filings, foundation 990s, news coverage, and a verified profile. More public disclosure scores higher.
Data: FEC, SEC EDGAR, ProPublica 990s, GDELT / NewsAPI, Wikidata
Formula (v2): PBS = 65% x Philanthropy + 35% x Transparency
Scored on 6/23/2026 on a 0–100 scale. The score uses only the signals we have populated data for. Goal Impact, Controversy, and Community Approval are deferred until that data exists — Phase 1 goal adoption, controversy detection, and community votes respectively.
All data is sourced from public records. Each section links to its original source. View on Wikidata