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
3
Roles reported
3
Others who share this name
1
Who this is
Profile
The filed facts are verified from the IRS filings. The biography is compiled from public web sources and grounded to that filed record.
Facts extracted directly from each organization's Form 990, Part VII.
Biography Web-sourced
President and CEO of Montefiore Nyack Hospital since 2014. Board-certified radiologist with Fellowship from American College of Radiology (FACR, 2023).
Named chair of Northern Metropolitan Hospital Association (2024-2025).
Compiled from public web sources (2 cited), grounded to the filed record.
Track record
Career & tenure
Real tenure, career, and education — from public web sources, what you need to vet a founder or leader beyond the filing window.
Tenure here
President and CEO since 2014
Education
philosophy) · Duke University (BA
SUNY Downstate (MD)
American Board of Radiology (board certification)
Affiliations
Organizations
Linked as the same person by IRS Schedule R, a shared officer mailing address, or shared fellow board members.
H
Healthcare Educational & Research Fund INCTrustee · $2.2M revenue · Rensselaer, NYOFFER EDUCATION, RESEARCH, & GRANTS TO SUPPORT THE MISSION OF THE HEALTHCARE ASSOCIATION OF NYS.Filed FY2024 · Source: Form 990, Part VII
Healthcare Association of New York State INCTrustee · $16.0M revenue · Rensselaer, NYADVANCE THE HEALTH OF INDI- VIDUALS THROUGH REPRESENTATION & SERVICE TO NYS HEALTH PROVIDERS.Filed FY2024, FY2023 · Source: Form 990, Part VII
Rockland Paradmedic Services INCCo-Chairpers · $10.5M revenue · New City, NYTO PROVIDE HIGH QUALITY PARAMEDIC AND EMERGENCY SERVICES IN ROCKLAND COUNTY AND SURROUNDING REGIONSFiled FY2023, FY2022, FY2021, FY2020 · Source: Form 990, Part VII
Disambiguation
Other people named Mark Geller MD
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.
M
Mark Geller MD2 organizations · Nyack, NYMontefiore Nyack Hospital
Network
Serves alongside
Other officers, directors & key employees at this person's organizations, by latest reported compensation.
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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