What is the EIN of THE EXPLORATORIUM?

The employer identification number (EIN) of THE EXPLORATORIUM is 94-1696494.

Is THE EXPLORATORIUM tax-exempt?

Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1969.

Are donations to THE EXPLORATORIUM tax-deductible?

Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).

When is the next return of THE EXPLORATORIUM due?

The return for tax year 2025 (the year ending June 30, 2026) is due November 16, 2026. Form 8868 extends it by six months; the 990-N cannot be extended.

When did THE EXPLORATORIUM last file with the IRS?

The latest return in the IRS public files is the 990 for the year ended June 2025.

Who is the principal officer of THE EXPLORATORIUM?

The 990 for the year ended June 30, 2025 names MARK BIERMAN.

Who are the officers and directors of THE EXPLORATORIUM?

The 990 for the year ended June 30, 2025 lists 49 people; 10 received compensation from the organization, the highest $744,010 (MARK BIERMAN, EXEC DIRECTOR).

How much revenue does THE EXPLORATORIUM have?

On its 990 for the year ended June 30, 2025 it reported revenue of $63,991,919, expenses of $67,798,808 and total assets of $292,041,625 at year end.

Nonprofit · EIN 94-1696494

THE EXPLORATORIUM

Tax-exempt · SAN FRANCISCO, CA 94111

Financials

Revenue Expenses · by fiscal year end

Financials of THE EXPLORATORIUM by year, from its e-filed returns
Year ended	Form	Revenue	Expenses	Net income	Total assets	Liabilities	Net assets
June 30, 2025	990	$63,991,919	$67,798,808	-$3,806,889	$292,041,625	$47,313,039	$244,728,586
June 30, 2024	990	$66,629,029	$65,980,256	$648,773	$293,014,681	$50,041,593	$242,973,088
June 30, 2023	990	$61,024,177	$64,760,247	-$3,736,070	$284,732,614	$48,867,190	$235,865,424

Financial details: 990 for the year ended June 30, 2025

Revenue

Contributions, gifts and grants: $27,618,230
of which government grants: $3,643,647
Program service revenue: $29,866,618
Investment income: $4,092,353
Net rental income: $2,119,074
Net gain from sales of assets: $2,489,104
Net income from fundraising events: -$510,872
Net income from sales of inventory: $806,516
Other revenue: $2,414,718

Expenses

Grants and similar amounts paid: $29,357
Compensation of officers, directors and key employees: $3,224,320
Salaries, compensation and benefits (total): $45,465,147
Professional fundraising fees: $0
Occupancy: $3,637,904
Travel: $783,580
Depreciation: $4,639,892
Program services (functional): $51,907,282
Management and general (functional): $12,372,029
Fundraising (functional): $3,519,497

Balance sheet and other

Total assets, start of year: $293,014,681
Total assets, end of year: $292,041,625
Total liabilities, end of year: $47,313,039
Net assets, end of year: $244,728,586
Land, buildings and equipment: $158,804,474
Publicly traded securities: $74,793,896
Net assets without donor restrictions: $130,641,819
Net assets with donor restrictions: $114,086,767
Gross unrelated business income: $60,775
Gross receipts: $101,246,098
Employees: 724
Volunteers: 175
Year formed: 1968
State of legal domicile: CA

From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.

Officers, directors and key employees

As listed on the 990 for the year ended June 30, 2025, highest compensation first.

Name	Title	Hours / week	Compensation	Other / benefits
MARK BIERMAN	EXEC DIRECTOR Officer	37.5	$744,010	$26,984
ROBERT SEMPER	CHIEF LEARNING OFFICER Key employee	37.5	$355,605	$17,296
LAURA ZANDER	CHIEF FINANCIAL OFFICER (THRU 6/30/2025) Officer	37.5	$328,417	$32,114
ANNE RICHARDSON	CHIEF EXPERIENCE OFFICER Highest-paid employee	37.5	$296,384	$22,831
BLAIR WINN	CHIEF ADVANCEMENT OFFICER Key employee	37.5	$282,663	$25,282
JASON PACELY	CHIEF PEOPLE OFFICER Key employee	37.5	$240,149	$49,744
JULIE NUNN	CHIEF BRAND OFFICER Highest-paid employee	37.5	$246,545	$24,278
ANNE HOLMES	CHIEF STRATEGY OFFICER Highest-paid employee	37.5	$237,632	$24,351
THOMAS ROCKWELL	CHIEF CREATIVE OFFICER Highest-paid employee	22.5	$178,365	$44,787
JULIE YU	PRINCIPAL SCIENTIST Highest-paid employee	37.5	$195,237	$23,598
WILLIAM BILL F MELLIN	CHAIR Trustee or director, Officer	2	$0	$0
MARTHA EHMANN CONTE	VICE-CHAIR Trustee or director, Officer	2	$0	$0
SHARON FLANAGAN	SECRETARY Trustee or director, Officer	2	$0	$0
KEVIN FOSTER	TREASURER Trustee or director, Officer	2	$0	$0
RAVIN AGRAWAL	DIRECTOR (THRU 12/31/2024) Trustee or director	2	$0	$0

34 more people on this return

Name	Title	Hours / week	Compensation
GENO ARMSTRONG	DIRECTOR (THRU 4/1/2025) Trustee or director	2	$0
DARREN BECHTEL	DIRECTOR Trustee or director	2	$0
GARY BENGIER	DIRECTOR (THRU 12/31/2024) Trustee or director	2	$0
LAMAR BUNTS	DIRECTOR Trustee or director	2	$0
JASON CHENG	DIRECTOR Trustee or director	2	$0
GEORGE W COGAN	DIRECTOR Trustee or director	2	$0
W BREWSTER ELY	DIRECTOR Trustee or director	2	$0
CHRIS FOSTER	DIRECTOR Trustee or director	2	$0
LYNN C FRITZ	DIRECTOR Trustee or director	2	$0
JOSIE HASPEL	DIRECTOR Trustee or director	2	$0
JONATHAN HEILIGER	DIRECTOR Trustee or director	2	$0
FRANCES HELLMAN	DIRECTOR Trustee or director	2	$0
GREGORY HUNTER	DIRECTOR Trustee or director	2	$0
MIMI ITO	DIRECTOR (THRU 10/29/2024) Trustee or director	2	$0
MICHAEL R JACOBSON	DIRECTOR Trustee or director	2	$0
JAMES JONES	DIRECTOR Trustee or director	2	$0
ROBERTA KATZ	DIRECTOR Trustee or director	2	$0
MARTIN LAUBER	DIRECTOR Trustee or director	2	$0
PHIL MARINEAU	DIRECTOR Trustee or director	2	$0
ALISON MAUZE	DIRECTOR Trustee or director	2	$0
MARY HOPE MH MCQUISTON	DIRECTOR Trustee or director	2	$0
KENNETH G MOORE	DIRECTOR Trustee or director	2	$0
REMY NTSHAYKOLO	DIRECTOR (THRU 12/31/2024) Trustee or director	2	$0
SAUL PERLMUTTER	DIRECTOR Trustee or director	2	$0
CAMERON PHLEGER	DIRECTOR Trustee or director	2	$0
ALBERT BERT RICHARDS	DIRECTOR Trustee or director	2	$0
VIJAY SHRIRAM	DIRECTOR Trustee or director	2	$0
CRAIG SILVERSTEIN	DIRECTOR Trustee or director	2	$0
RACHEL SKIFFER	DIRECTOR Trustee or director	2	$0
E PAYSON SKIP SMITH	DIRECTOR Trustee or director	2	$0
REMY WILKINSON	DIRECTOR (THRU 8/11/2024) Trustee or director	2	$0
ESTHER WOJCICKI	DIRECTOR Trustee or director	2	$0
JENNIFER VAN NATTA	DIRECTOR Trustee or director	2	$0
DAN YUE	DIRECTOR Trustee or director	2	$0

990 for the year ended June 30, 2024: 50 people

Name	Title	Hours / week	Compensation	Other / benefits
MARK BIERMAN	EXECUTIVE DIRECTOR Officer	37.5	$583,952	$25,058
PHOEBE WHITE	CHIEF OPERATING OFC. (THRU 9/22/23) Key employee	37.5	$344,719	$10,416
ROBERT SEMPER	CHIEF LEARNING OFFICER Key employee	37.5	$314,320	$16,844
LAURA ZANDER	CHIEF FINANCIAL & OPERATING OFFICER Officer	37.5	$286,820	$37,493
BLAIR WINN	CHIEF ADVANCEMENT OFFICER Key employee	37.5	$257,640	$23,118
JULIE NUNN	CHIEF BRAND OFFICER Highest-paid employee	37.5	$216,235	$21,545
ANNE RICHARDSON	CHIEF EXPERIENCE OFFICER Highest-paid employee	37.5	$215,636	$16,672
JASON PACELY	CHIEF PEOPLE OFFICER Highest-paid employee	37.5	$209,277	$22,896
THOMAS ROCKWELL	CHIEF CREATIVE OFFICER Highest-paid employee	37.5	$183,092	$29,019
ANNE HOLMES	CHIEF STRATEGY OFFICER Highest-paid employee	37.5	$181,139	$19,299
WILLIAM BILL F MELLIN	CHAIR Trustee or director, Officer	2	$0	$0
MARTHA EHMANN CONTE	VICE-CHAIR Trustee or director, Officer	2	$0	$0
IRVENIA WATERS	VICE-CHAIR Trustee or director, Officer	2	$0	$0
SHARON FLANAGAN	SECRETARY Trustee or director, Officer	2	$0	$0
LAMAR BUNTS	TREASURER Trustee or director, Officer	2	$0	$0
RAVIN AGRAWAL	DIRECTOR Trustee or director	2	$0	$0
GENO ARMSTRONG	DIRECTOR Trustee or director	2	$0	$0
DARREN BECHTEL	DIRECTOR Trustee or director	2	$0	$0
GARY BENGIER	DIRECTOR Trustee or director	2	$0	$0
GEORGE W COGAN	DIRECTOR Trustee or director	2	$0	$0
W BREWSTER ELY	DIRECTOR Trustee or director	2	$0	$0
CHRIS FOSTER	DIRECTOR Trustee or director	2	$0	$0
KEVIN FOSTER	DIRECTOR Trustee or director	2	$0	$0
LYNN C FRITZ	DIRECTOR Trustee or director	2	$0	$0
JONATHAN HEILIGER	DIRECTOR Trustee or director	2	$0	$0
FRANCES HELLMAN	DIRECTOR Trustee or director	2	$0	$0
F SCOTT HINDES	DIRECTOR Trustee or director	2	$0	$0
GREGORY HUNTER	DIRECTOR Trustee or director	2	$0	$0
MIMI ITO	DIRECTOR Trustee or director	2	$0	$0
MICHAEL R JACOBSON	DIRECTOR Trustee or director	2	$0	$0
JAMES JONES	DIRECTOR Trustee or director	2	$0	$0
ROBERTA KATZ	DIRECTOR Trustee or director	2	$0	$0
MARTIN LAUBER	DIRECTOR Trustee or director	2	$0	$0
PHIL MARINEAU	DIRECTOR Trustee or director	2	$0	$0
ALISON MAUZE	DIRECTOR Trustee or director	2	$0	$0
MARY HOPE MH MCQUISTON	DIRECTOR Trustee or director	2	$0	$0
KENNETH G MOORE	DIRECTOR Trustee or director	2	$0	$0
REMY NTSHAYKOLO	DIRECTOR Trustee or director	2	$0	$0
SAUL PERLMUTTER	DIRECTOR Trustee or director	2	$0	$0
CAMERON PHLEGER	DIRECTOR Trustee or director	2	$0	$0
VINCENT L RICCI	DIRECTOR (THRU 12/12/23) Trustee or director	2	$0	$0
ALBERT BERT RICHARDS	DIRECTOR Trustee or director	2	$0	$0
VIJAY SHRIRAM	DIRECTOR Trustee or director	2	$0	$0
CRAIG SILVERSTEIN	DIRECTOR Trustee or director	2	$0	$0
RACHEL SKIFFER	DIRECTOR Trustee or director	2	$0	$0
E PAYSON SKIP SMITH	DIRECTOR Trustee or director	2	$0	$0
JENNIFER VAN NATTA	DIRECTOR Trustee or director	2	$0	$0
REMY WILKINSON	DIRECTOR Trustee or director	2	$0	$0
ESTHER WOJCICKI	DIRECTOR Trustee or director	2	$0	$0
DAN YUE	DIRECTOR Trustee or director	2	$0	$0

990 for the year ended June 30, 2023: 56 people

Name	Title	Hours / week	Compensation	Other / benefits
MARK BIERMAN	EXECUTIVE DIRECTOR Officer	37.5	$511,137	$5,469
LAURA ZANDER	CHIEF FINANCIAL & OPERATING OFFICER Officer	37.5	$305,738	$38,775
ROBERT SEMPER	CHIEF SCIENCE OFFICER Key employee	37.5	$302,784	$16,266
PHOEBE WHITE	MANAGING DIRECTOR Key employee	37.5	$281,012	$14,088
THOMAS ROCKWELL	SR. CREATIVE DIR. OF GLBL COLLABS Highest-paid employee	37.5	$241,439	$31,065
BLAIR WINN	SR. DIR. OF INST. ADVANCEMENT Key employee	37.5	$246,443	$22,107
JULIE NUNN	DIR. OF SALES & MARKETING Highest-paid employee	37.5	$186,119	$19,529
JESSICA PARKER	SR. DIR. OF EDUC ENGAGEMENT Highest-paid employee	37.5	$167,900	$23,873
ANNE RICHARDSON	SR. DIR. OF GLOBAL COLLABS Highest-paid employee	37.5	$144,334	$24,392
ANNE HOLMES	SR. DIR. OF SCIENCE ARTS & RSRCH Highest-paid employee	37.5	$147,792	$20,069
CHRIS FLINK	FORMER EXECUTIVE DIRECTOR Former	0	$16,371	$1,634
WILLIAM BILL F MELLIN	CHAIR Trustee or director, Officer	2	$0	$0
MARTHA EHMANN CONTE	VICE-CHAIR Trustee or director, Officer	2	$0	$0
ROBERTA KATZ	VICE-CHAIR Trustee or director, Officer	2	$0	$0
SHARON FLANAGAN	SECRETARY Trustee or director, Officer	2	$0	$0
LAMAR BUNTS	TREASURER Trustee or director, Officer	2	$0	$0
RAVIN AGRAWAL	DIRECTOR Trustee or director	2	$0	$0
GENO ARMSTRONG	DIRECTOR Trustee or director	2	$0	$0
DARREN BECHTEL	DIRECTOR Trustee or director	2	$0	$0
GARY BENGIER	DIRECTOR Trustee or director	2	$0	$0
LINDSAY BIERMAN	DIRECTOR Trustee or director	2	$0	$0
GEORGE W COGAN	DIRECTOR Trustee or director	2	$0	$0
W BREWSTER ELY	DIRECTOR Trustee or director	2	$0	$0
CHRIS FOSTER	DIRECTOR Trustee or director	2	$0	$0
KEVIN FOSTER	DIRECTOR Trustee or director	2	$0	$0
LYNN C FRITZ	DIRECTOR Trustee or director	2	$0	$0
JONATHAN HEILIGER	DIRECTOR Trustee or director	2	$0	$0
FRANCES HELLMAN	DIRECTOR Trustee or director	2	$0	$0
F SCOTT HINDES	DIRECTOR Trustee or director	2	$0	$0
GREGORY HUNTER	DIRECTOR Trustee or director	2	$0	$0
MIMI ITO	DIRECTOR Trustee or director	2	$0	$0
MICHAEL R JACOBSON	DIRECTOR Trustee or director	2	$0	$0
JAMES JONES	DIRECTOR Trustee or director	2	$0	$0
MARTIN LAUBER	DIRECTOR Trustee or director	2	$0	$0
PHIL MARINEAU	DIRECTOR Trustee or director	2	$0	$0
ALISON MAUZE	DIRECTOR Trustee or director	2	$0	$0
MARY HOPE MH MCQUISTON	DIRECTOR Trustee or director	2	$0	$0
KENNETH G MOORE	DIRECTOR Trustee or director	2	$0	$0
REMY NTSHAYKOLO	DIRECTOR Trustee or director	2	$0	$0
SAUL PERLMUTTER	DIRECTOR Trustee or director	2	$0	$0
CAMERON PHLEGER	DIRECTOR Trustee or director	2	$0	$0
VINCENT L RICCI	DIRECTOR Trustee or director	2	$0	$0
ALBERT BERT RICHARDS	DIRECTOR Trustee or director	2	$0	$0
VIJAY SHRIRAM	DIRECTOR Trustee or director	2	$0	$0
CRAIG SILVERSTEIN	DIRECTOR Trustee or director	2	$0	$0
RACHEL SKIFFER	DIRECTOR Trustee or director	2	$0	$0
E PAYSON SKIP SMITH	DIRECTOR Trustee or director	2	$0	$0
JENNIFER VAN NATTA	DIRECTOR Trustee or director	2	$0	$0
IRVENIA WATERS	DIRECTOR Trustee or director	2	$0	$0
REMY WILKINSON	DIRECTOR Trustee or director	2	$0	$0
DAN YUE	DIRECTOR Trustee or director	2	$0	$0
ESTHER WOJCICKI	DIRECTOR Trustee or director	2	$0	$0
ANTHONY TONY F EARLEY JR	DIRECTOR (THRU 3/23) Trustee or director	2	$0	$0
BARBARA A CARBONE	DIRECTOR (THRU 6/23) Trustee or director	2	$0	$0
MICKEY HART	DIRECTOR (THRU 6/23) Trustee or director	2	$0	$0
AARON VERMUT	DIRECTOR (THRU 6/23) Trustee or director	2	$0	$0

Address and contacts

Address (IRS master file): PIER 17 SUITE 100, SAN FRANCISCO, CA 94111-0000
In care of: % LAURA ZANDER
Principal officer (990 for 2024): MARK BIERMAN, 17 PIER 100, SAN FRANCISCO, CA 941111455
Signed the 990: MELANIE TWARDZICKI, ACTING CHEIF FINANCIAL OFFICER
Phone: (415) 528-4444
Website: EXPLORATORIUM.EDU
Return prepared by: RSM US LLP

California records

California keeps its own records of charities and corporations. Search them by EIN 94-1696494 or by the name THE EXPLORATORIUM.

Attorney General, Registry of Charities and Fundraisers: Registration status and filed reports (CT-TR-1, RRF-1)
Secretary of State, bizfile Online: Corporation status, entity number, agent for service
Franchise Tax Board: Entity status letter (state tax exemption, good standing)

Mission

THE EXPLORATORIUM IS A PUBLIC LEARNING LABORATORY EXPLORING THE WORLD THROUGH SCIENCE, ART, AND HUMAN PERCEPTION. OUR MISSION IS TO CREATE INQUIRY-BASED EXPERIENCES THAT TRANSFORM LEARNING WORLDWIDE.
990 for the year ended June 30, 2025

Program accomplishments

MUSEUM AND VISITOR EXPERIENCE:WE'RE AN R&D LABORATORY THAT EXPERIMENTS WITH CUTTING-EDGE IDEAS. WE CREATE, EXPERIMENT, TEST, AND BUILD NEARLY EVERYTHING AT THE EXPLORATORIUM OURSELVES, ALWAYS LOOKING FOR THE MOST INTERESTING AND IMPORTANT IDEAS TO PURSUE, OFTEN PUSHING THE LIMITS OF WHAT'S POSSIBLE. IN THIS SENSE, WE'RE A CLASSIC RESEARCH-AND-DEVELOPMENT ORGANIZATION, CONSTANTLY CREATING NEW ACTIVITIES, WEBSITES, EVENTS, ARTWORKS, EXHIBITS, AND MORE.
Expenses $34,141,791 · revenue $11,645,149
GLOBAL COLLABORATIONS:WE LEARN AND SHARE WITH PARTNERS WORLDWIDE. BY DRAWING ON THE EXPLORATORIUM'S BROAD EXPERTISE, GLOBAL COLLABORATIONS IS ABLE TO PROVIDE A COMPREHENSIVE SET OF CREATIVE SERVICES FROM MASTER PLANNING TO PROGRAM DEVELOPMENT TO EXHIBIT FABRICATION AND INSTALLATION. WE LIKE TO BE AS FAR UPSTREAM IN OUR CLIENTS' CREATIVE PROCESS AS POSSIBLE, EXPLORING THE RICH QUESTIONS THAT LEAD TO TRULY AUTHENTIC, INNOVATIVE PROBLEM SOLVING.
Expenses $7,502,446 · revenue $12,250,790
EDUCATOR ENGAGEMENT:WE'RE AT THE FOREFRONT OF SCIENCE EDUCATION. BY MAKING SCIENCE VISIBLE, TOUCHABLE, AND ACCESSIBLE TO A WIDE VARIETY OF PEOPLE AT THE MUSEUM, ONLINE, AND IN THE CLASSROOM, OUR EXPLORE-FOR-YOURSELF WAY OF LEARNING AND TEACHING INFLUENCES SCIENCE EDUCATION WORLDWIDE. OUR PROFESSIONAL DEVELOPMENT PROGRAMS PROVIDE EDUCATORS WITH THE SKILLS, TOOLS, AND SUPPORT THEY NEED TO APPLY INQUIRY-BASED LEARNING AND TEACHING IN THEIR CLASSES. WE ALSO DESIGN PROGRAMS THAT MAKE CONNECTIONS BETWEEN THE TRADITIONALLY SEPARATE WORLDS OF FORMAL (SCHOOL) AND INFORMAL (MUSEUM) EDUCATION AND UNDERSTANDING.
Expenses $10,263,045 · grants $29,357 · revenue $6,701,072

What it must file and when

IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in June, so each return is due on the 15th day of the 5th month after that.

Tax year	Year ended	Due	IRS public records
2025	June 30, 2026	November 16, 2026	Not due yet
2024	June 30, 2025	November 17, 2025	990 on file
2023	June 30, 2024	November 15, 2024	990 on file

IRS record

EIN: 94-1696494
Tax-exempt status: 501(c)(3): Charitable, religious, educational or scientific organization
Foundation status: Publicly supported organization (170(b)(1)(A)(vi))
Donations deductible (Pub 78): Public charity, 50% deduction limit
Exempt since: 1969
Accounting year ends: June
Files: Form 990 or 990-EZ
Category (NTEE): Arts, culture and humanities (A500)
Assets (IRS master file): $292,041,625
Income (IRS master file): $101,246,098

Filing history

Form	Year ended	Revenue	Expenses	Assets	Return
990	June 2025	$63,991,919	$67,798,808	$292,041,625	IRS
990-T	June 2025	–	–	–	IRS
990	June 2024	$66,629,029	$65,980,256	$293,014,681	IRS
990-T	June 2024	–	–	–	IRS
990	June 2023	$61,024,177	$64,760,247	$284,732,614	XML
990-T	June 2023	–	–	–	IRS
990	June 2022	$79,571,391	$59,221,371	$275,042,102	IRS
990-T	June 2022	–	–	–	IRS
990	June 2021	–	–	–	IRS
990-T	June 2021	–	–	–	IRS
990	June 2020	–	–	–	IRS
990	June 2019	–	–	–	IRS
990	June 2018	–	–	–	IRS

990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 94-1696494).

Questions about THE EXPLORATORIUM

What is the EIN of THE EXPLORATORIUM?: The employer identification number (EIN) of THE EXPLORATORIUM is 94-1696494.
Is THE EXPLORATORIUM tax-exempt?: Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1969.
Are donations to THE EXPLORATORIUM tax-deductible?: Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
Which annual return does THE EXPLORATORIUM file?: Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
When is the next return of THE EXPLORATORIUM due?: The return for tax year 2025 (the year ending June 30, 2026) is due November 16, 2026. Form 8868 extends it by six months; the 990-N cannot be extended.
When did THE EXPLORATORIUM last file with the IRS?: The latest return in the IRS public files is the 990 for the year ended June 2025.
Who is the principal officer of THE EXPLORATORIUM?: The 990 for the year ended June 30, 2025 names MARK BIERMAN.
Who are the officers and directors of THE EXPLORATORIUM?: The 990 for the year ended June 30, 2025 lists 49 people; 10 received compensation from the organization, the highest $744,010 (MARK BIERMAN, EXEC DIRECTOR).
How much revenue does THE EXPLORATORIUM have?: On its 990 for the year ended June 30, 2025 it reported revenue of $63,991,919, expenses of $67,798,808 and total assets of $292,041,625 at year end.

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SAN FRANCISCO OPERA ASSOCIATION
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