Ambiguous identityThis name matches 1 other individual we could not verify as the same person. Each is kept as a separate record below — treat them as distinct people unless an explicit match is confirmed.
Organizations
2
Roles reported
2
Others who share this name
1
Who this is
Profile
Everything on the left is verified from the IRS filings. The biography on the right is compiled from public web sources and grounded to that filed record.
✓ Verified from filings
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Reported as Treasurer of Lark Theater, based in Larkspur, CA.
Facts extracted directly from each organization's Form 990, Part VII.
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Affiliations
Organizations
Linked as the same person by IRS Schedule R, a shared officer mailing address, or shared fellow board members.
Lark TheaterTreasurer · $2.6M revenue · Larkspur, CATo maintain and advance the 1936 Art Deco Lark Theater as a single-screen/single-stage, state-of the-art community film and cultural center with…Filed FY2025, FY2024, FY2023, FY2022, FY2021, FY2020 · Source: Form 990, Part VII
The Commons FoundationBoard Member · $2.0M revenue · Larkspur, CAOUR MISSION IS TO SUPPORT LARKSPUR LIBRARY AS WELL AS COMMUNITY CENTERS AND OPEN PUBLIC SPACES IN THE CITY OF LARKSPUR, CALIFORNIA.Filed FY2021, FY2020 · Source: Form 990, Part VII
Disambiguation
Other people named Jon Ellenzweig
Different individuals who share this name, separated by IRS Schedule R, mailing address, and shared-board evidence. The 990 carries no person identifier, so some may still be the same person.
J
Jon Ellenzweig1 organization · Corte Madera, CAMarin Girls Softball League
Network
Serves alongside
Other officers, directors & key employees at this person's organizations, by latest reported compensation.
Executive & Artistic Director · The Carnegie Hall Corporation
$2.6M
Public data from IRS Form 990 e-file & the Business Master File. Individuals appear here because they were named as an officer, director, or key employee on a nonprofit's Form 990; people are grouped by name plus corroborating evidence (Schedule R, shared address, shared board members). · philanthropy.org
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the organization.