Nonprofit · EIN 31-0921099
MAYFIELD EDUCATION AND RESEARCH FUND
Tax-exempt · CINCINNATI, OH 45209
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| September 30, 2025 | 990 | $1,824,779 | $1,519,563 | $305,216 | $11,110,243 | $404,695 | $10,705,548 |
| September 30, 2024 | 990 | $2,045,989 | $1,010,844 | $1,035,145 | $9,319,272 | $0 | $9,319,272 |
| September 30, 2023 | 990 | $913,355 | $990,433 | -$77,078 | $6,428,572 | $0 | $6,428,572 |
Financial details: 990 for the year ended September 30, 2025
Revenue
- Contributions, gifts and grants
- $1,121,881
- Program service revenue
- $514,705
- Investment income
- $174,219
- Net rental income
- $13,974
- Other revenue
- $13,974
Expenses
- Grants and similar amounts paid
- $212,500
- Compensation of officers, directors and key employees
- $65,276
- Other salaries and wages
- $559,732
- Salaries, compensation and benefits (total)
- $625,008
- Professional fundraising fees
- $0
- Legal fees
- $14,809
- Accounting fees
- $2,873
- Occupancy
- $133,044
- Travel
- $17,877
- Depreciation
- $52,000
- Program services (functional)
- $1,128,535
- Management and general (functional)
- $328,527
- Fundraising (functional)
- $62,501
Balance sheet and other
- Total assets, start of year
- $9,319,272
- Total assets, end of year
- $11,110,243
- Total liabilities, end of year
- $404,695
- Net assets, end of year
- $10,705,548
- Land, buildings and equipment
- $91,866
- Publicly traded securities
- $10,714,197
- Gross receipts
- $1,824,779
- Employees
- 0
- Volunteers
- 15
- Year formed
- 1977
- State of legal domicile
- OH
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 September 30, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| SONIA LIPP | DIRECTOR OF RESEARCH Highest-paid employee | 40 | $145,337 | $35,056 |
| DEBORAH LIVINGSTON | DEVELOPMENT DIRECTOR Highest-paid employee | 40 | $127,883 | $30,835 |
| WILLIAM D TOBLER MD | CHAIRMAN Trustee or director, Officer | 4 | $65,275 | $0 |
| MICHAEL J RADOMSKI | TREASURER Trustee or director, Officer | 3 | $0 | $0 |
| ROBERT RICH ESQ | SECRETARY Trustee or director, Officer | 1 | $0 | $0 |
| AMY MURRAY | TRUSTEE Trustee or director | 0.3 | $0 | $0 |
| ANDREW J RINGER MD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| BRADBURY A SKIDMORE MD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| BRIAN GWYN | TRUSTEE - START 02/25 AND EXIT 08/25 Trustee or director | 0.3 | $0 | $0 |
| BRYAN KRUEGER MD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JAMES HORN MD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JAMES J MCGRAW JR ESQ | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JEFFREY T KELLER PHD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| KEVIN SCHULER | TRUSTEE - START 02/25 Trustee or director | 1 | $0 | $0 |
| LAURA GUGGENHEIM | TRUSTEE Trustee or director | 1 | $0 | $0 |
6 more people on this return
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| LAUREN R OSTLING MD | TRUSTEE Trustee or director | 1 | $0 |
| MARLA SANTOS SILLIMAN | TRUSTEE Trustee or director | 1 | $0 |
| MICHAEL STENGER | TRUSTEE Trustee or director | 1 | $0 |
| VALERIE NEWELL CPA | TRUSTEE Trustee or director | 1 | $0 |
| VICTOR DIPILLA | TRUSTEE - EXIT 07/25 Trustee or director | 1 | $0 |
| VINCENT DINAPOLI MD PHD | TRUSTEE Trustee or director | 1 | $0 |
990 for the year ended September 30, 2024: 17 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| AMY MURRAY START 82324 | TRUSTEE Trustee or director | 0.25 | $0 |
| VALERIE NEWELL CPA | TRUSTEE Trustee or director | 1 | $0 |
| VICTOR DIPILLA | TRUSTEE Trustee or director | 1 | $0 |
| JAMES J MCGRAW JR ESQ | TRUSTEE Trustee or director | 1 | $0 |
| LAURA GUGGENHEIM | TRUSTEE Trustee or director | 1 | $0 |
| ANDREW J RINGER MD | TRUSTEE Trustee or director | 1 | $0 |
| BRADBURY A SKIDMORE MD | TRUSTEE Trustee or director | 1 | $0 |
| BRYAN KRUEGER MD | TRUSTEE Trustee or director | 1 | $0 |
| JAMES HORN MD | TRUSTEE Trustee or director | 1 | $0 |
| LAUREN R OSTLING MD | TRUSTEE Trustee or director | 1 | $0 |
| WILLIAM D TOBLER MD | PRESIDENT Trustee or director, Officer | 1 | $0 |
| JEFFREY T KELLER PHD | TRUSTEE Trustee or director | 1 | $0 |
| VINCENT DINAPOLI MD PHD | TRUSTEE Trustee or director | 1 | $0 |
| MARLA SANTOS SILLIMAN | TRUSTEE Trustee or director | 1 | $0 |
| MICHAEL STENGER | TRUSTEE Trustee or director | 1 | $0 |
| ROBERT RICH ESQ | SECRETARY Officer | 0.25 | $0 |
| MICHAEL J RADOMSKI | TREASURER Officer | 1 | $0 |
990 for the year ended September 30, 2023: 16 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| VALERIE NEWELL CPA | TRUSTEE Trustee or director | 1 | $0 |
| VICTOR DIPILLA | TRUSTEE Trustee or director | 1 | $0 |
| JAMES J MCGRAW JR ESQ | TRUSTEE Trustee or director | 1 | $0 |
| LAURA GUGGENHEIM | TRUSTEE Trustee or director | 1 | $0 |
| ANDREW J RINGER MD | TRUSTEE Trustee or director | 1 | $0 |
| BRADBURY A SKIDMORE MD | TRUSTEE Trustee or director | 1 | $0 |
| BRYAN KRUEGER MD | TRUSTEE Trustee or director | 1 | $0 |
| JAMES HORN MD | TRUSTEE Trustee or director | 0.75 | $0 |
| LAUREN R OSTLING MD | TRUSTEE Trustee or director | 1 | $0 |
| WILLIAM D TOBLER MD | PRESIDENT Trustee or director, Officer | 1 | $0 |
| JEFFREY T KELLER PHD | TRUSTEE Trustee or director | 1 | $0 |
| VINCENT DINAPOLI MD PHD | TRUSTEE Trustee or director | 1 | $0 |
| MARLA SILLIMAN | TRUSTEE Trustee or director | 1 | $0 |
| MIKE STENGER | TRUSTEE Trustee or director | 0.5 | $0 |
| ROBERT RICH ESQ | SECRETARY Officer | 0.25 | $0 |
| MICHAEL J RADOMSKI | TREASURER Officer | 1 | $0 |
Address and contacts
- Address (IRS master file)
- 3825 EDWARDS RD STE 300, CINCINNATI, OH 45209-1288
- Principal officer (990 for 2024)
- WILLIAM D TOBLER MD, 3825 EDWARDS ROAD 300, CINCINNATI, OH 452091149
- Signed the 990
- WILLIAM D TOBLER MD, CHAIRMAN
- Phone
- (513) 221-1100
- Website
- MAYFIELDFOUNDATION.ORG
- Return prepared by
- BARNES DENNIG & CO LTD
Mission
NEUROSCIENCE RESEARCH & EDUCATION.
Program accomplishments
- EDUCATION: MAYFIELD EDUCATION AND RESEARCH FOUNDATION HOSTS 2 LECTURESHIPS AND 1 CLINIC ANNUALLY. THE HERCH LECTURESHIP WAS ESTABLISHED IN 2023 IS A 2-DAY COURSE FOR RESIDENTS AND FELLOWS, THAT FOCUSES ON INNOVATIVE SPINE SURGERY TOOLS AND TECHNIQUES THAT WILL IMPROVE THE LIVES OF PATIENTS WITH SPINE DISORDERS. OVER THE 2-DAY COURSE, RESIDENTS AND FELLOWS ATTEND LECTURES AND HANDS ON LABS. THE KELLER LECTURESHIP WAS ESTABLISHED IN 2011 TO ENHANCE RESIDENT AND FELLOWSHIP PROGRAMS BY SUPPORTING AN INVITED LECTURER OF INTERNATIONAL STATURE IN THE FIELD OF SKULL BASE SURGERY AND SURGICAL ANATOMY. THE KELLER LECTURESHIP OFFERS THE OPPORTUNITY FOR MEDICAL STUDENTS, RESIDENTS, FELLOWS, AND FACULTY TO LEARN FIRSTHAND FROM RENOWNED NEUROSURGEONS. THE WINTER CLINICS FOR CRANIAL AND SPINAL SURGERY HAS BEEN HOSTED BY MAYFIELD EDUCATION AND RESEARCH FOUNDATION FOR MORE THAN 3 DECADES. THE CLINIC ALLOWS NEUROSURGERY PARTICIPANTS FROM 37 STATES AND FIVE COUNTRIES TO GATHER TO EXPERIENCE RESEARCH, NETWORKING, AND PROFESSIONAL DEVELOPMENT.Expenses $400,868 · revenue $245,964
- CLINICAL TRIALS: MAYFIELD EDUCATION AND RESEARCH FOUNDATION PROVIDES DEDICATED STAFF TO CONDUCT CLINICAL TRIALS, SUBMIT RESEARCH PROTOCOLS AND PROPOSALS, AID IN DATA COLLECTION, ASSIST WITH STATISTICAL ANALYSIS, AND SUPPORT FINAL JOURNAL PUBLICATION WITH MEDICAL WRITING, ILLUSTRATION, AND PRESENTATION SUPPORT THROUGH GLIA MEDIA. NETWORK OF COLLABORATIVE PARTNERS INCLUDE THE LINDNER RESEARCH CENTER AT THE CHRIST HOSPITAL, OHC AT THE JEWISH HOSPITAL, AND THE TRIHEALTH HATTON RESEARCH INSTITUTE. THERE WERE 15 CLINICAL TRIALS FOR THE PERIOD 10/1/24 TO 9/30/25, INCLUDING QUARTERLY TRIALS FOR GT MEDICAL TECHNOLOGIES, PERIODIC TRIALS FOR MEDTRONIC, ORTHO FIX, AND NEVRO.Expenses $292,328 · revenue $124,692
- LABS: MAYFIELD EDUCATION RESEARCH FOUNDATION PROVIDES A SPACE AND SUPPORT FOR SURGICAL TRAINING LABS FOR NEUROSCIENCE, ORTHOPEDICS, ENT, AND GENERAL SURGERY. SERVICES PROVIDED INCLUDE SKILLED STAFF TO ASSIST WITH PLANNING AND PROMOTION, ASSISTANCE WITH SPECIMEN PROCUREMENT, AND LOGISTICS STAFF FOR THE EVENT. THE 1,500 SQUARE FOOT LAB A 1,000 SQUARE FOOT CONFERENCE ROOM ARE LOCATED AT THE MAYFIELD SURGICAL INNOVATION CENTER IN CINCINNATI, OH. 14 LABS WERE HELD DURING THE PERIOD 10/1/24 TO 9/30/25 BY MOUNT ST. JOSEPH, INSPIRE, THE CHRIST HOSPITAL, COLOPLAST, SI BONE, ARTHREX, MEDTRONIC, PROVIDENCE MEDICAL AND ESSENTIAL ROBOTICS.Expenses $189,567 · revenue $144,049
- BRAIN TUMOR INSTITUTE: THE BRAIN TUMOR INSTITUTE WAS CREATED IN 2024 TO ENHANCE THE ACCESS TO CLINICAL TRIALS FOR PATIENTS WITH BRAIN TUMORS AND RECRUIT SPECIALISTS WHO CAN IMPROVE CARE FOR PATIENTS AT MULTIPLE HOSPITAL SERVICES. THE BTI PROVIDES A FULL SPECTRUM OF CARE TO PATIENTS WITH BRAIN TUMORS AND PROMOTES RESEARCH THAT WILL ENHANCE CARE FOR GENERATIONS TO COME. THE VISION OF THE BTI IS TO MAKE GREATER CINCINNATI A NATIONAL DESTINATION FOR ELITE BRAIN TUMOR CARE.Expenses $245,772 · grants $212,500
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 December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | Not on file |
| 2024 | December 31, 2024 | May 15, 2025 | Check at the IRS |
| 2023 | December 31, 2023 | May 15, 2024 | Check at the IRS |
IRS record
- EIN
- 31-0921099
- 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
- 1979
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Health care (E00J)
- Assets (IRS master file)
- $11,110,243
- Income (IRS master file)
- $1,824,779
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | September 2025 | $1,824,779 | $1,519,563 | $11,110,243 | XML |
| 990 | September 2024 | $2,045,989 | $1,010,844 | $9,319,272 | XML |
| 990 | September 2023 | $913,355 | $990,433 | $6,428,572 | XML |
| 990 | September 2022 | $3,358,575 | $1,201,850 | $5,683,899 | IRS |
| 990 | September 2021 | – | – | – | IRS |
| 990 | September 2020 | – | – | – | IRS |
| 990 | September 2019 | – | – | – | IRS |
| 990 | September 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 31-0921099).
Questions about MAYFIELD EDUCATION AND RESEARCH FUND
- What is the EIN of MAYFIELD EDUCATION AND RESEARCH FUND?
- The employer identification number (EIN) of MAYFIELD EDUCATION AND RESEARCH FUND is 31-0921099.
- Is MAYFIELD EDUCATION AND RESEARCH FUND tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1979.
- Are donations to MAYFIELD EDUCATION AND RESEARCH FUND tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does MAYFIELD EDUCATION AND RESEARCH FUND 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 MAYFIELD EDUCATION AND RESEARCH FUND due?
- The return for tax year 2025 (the year ending December 31, 2025) is due May 15, 2026. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did MAYFIELD EDUCATION AND RESEARCH FUND last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended September 2025.
- Who is the principal officer of MAYFIELD EDUCATION AND RESEARCH FUND?
- The 990 for the year ended September 30, 2025 names WILLIAM D TOBLER MD.
- Who are the officers and directors of MAYFIELD EDUCATION AND RESEARCH FUND?
- The 990 for the year ended September 30, 2025 lists 21 people; 3 received compensation from the organization, the highest $145,337 (SONIA LIPP, DIRECTOR OF RESEARCH).
- How much revenue does MAYFIELD EDUCATION AND RESEARCH FUND have?
- On its 990 for the year ended September 30, 2025 it reported revenue of $1,824,779, expenses of $1,519,563 and total assets of $11,110,243 at year end.
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