Hydrologic Research Center
Donations deductibleRevenue
$2.3m
year to 30 September 2025
Expenses
$2.5m
year to 30 September 2025
Total assets
$1.1m
$579k liabilities
Net assets
$540k
assets less liabilities
Directors and trustees
5
6.0y av
Staff
19
employees, year to 30 September 2025
Left since last filing
0
no seats appear to have opened
Officers and senior staff
7
named in Part VII
Hydrologic Research Center's network
5 people1 organisationi5 people and 1 organisation on this map.The large node is the subject of this page. Solid lines are what the register itself records (5). Violet dotted lines (1) are likely: the same full name sits on the current board of another organisation in the same register and region. Form 990 filings give names without a person identifier; SEC insider filings carry a CIK. It may be a different person.The board
5 listediTime on the board is observed from the annual filings: the IRS files no appointment date, so the bar counts years from the first filing the person appears on - a lower bound, not a filed start date. Names are exactly as filed. The IRS publishes no person identifier, so this edition does not yet link a person across organisations in the tables. The network map shows same-name matches as likely links only, never as confirmed.Tenure and departures are observed across annual filings. Observed tenure is a lower bound - a member may have joined before the first year on record. The organisation reported 3 voting members of its governing body on its latest Form 990 Part VI, which matches the board listed here.| Name | Role as filed | Since | On the board |
|---|---|---|---|
| Dr Konstantine Georgakakos (also filed as Dr Konstantine Georgakakos) | President | 2020 | 6 yrs |
| Dr Theresa Modrick Hansen | Company secretary | 2024 | 2 yrs |
| Jason Sperfslage | Treasurer | 2020 | 6 yrs |
| Raymond BAN | Director | 2020 | 6 yrs |
| Robert Hartman | Director | 2018 | 8 yrs |
Under 5 years5 to 6 years6 years or more
Officers and senior leadership
7 listediNamed in Part VII as officers, key employees or highest-compensated staff - not board members, shown for completeness.| Name | Title as filed | On the filings |
|---|---|---|
| Dr Konstantine Georgakakos | President | since 2018 |
| Dr Olufemi Osidele | CEO | since 2024 |
| Eylon Shamir | Engineer | since 2018 |
| Jason Sperfslage | Treasurer | since 2018 |
| Mehret Isaac | Financial Manager | 2025 |
| Robert Jubach | Company secretary | since 2018 |
| Theresa Modrick Hansen | Engineer | since 2018 |
Pay and hours
year to 30 September 2025iFrom Part VII of the Form 990: compensation reported for each officer, director, trustee, key employee and highest-paid staff member, and the average hours a week they report. Most board members are unpaid; a blank means nothing was reported. Pay from related organisations is shown separately.| Name | Title as filed | Hours a week | Pay from the organisation | Related organisations | Other |
|---|---|---|---|---|---|
| DR Olufemi Osidele | CEO | 40 | $232k | $20k | |
| Dr Theresa Modrick Hansen | Secretary | 40 | $165k | $8k | |
| Jason Sperfslage | Treasurer | 40 | $165k | $15k | |
| Eylon Shamir | Engineer | 40 | $144k | $33k | |
| Christopher Spencer | Computer Programme | 40 | $128k | $11k | |
| Rochelle Campbell | Meteorologist | 40 | $105k | $14k | |
| Mehret Isaac | Financial Manager | 40 | $102k | $5k | |
| Dr Konstantine Georgakakos | President | 40 | $0 | ||
| Robert Hartman | Director | 2 | $0 | ||
| Raymond Ban | Director | 2 | $0 |
About
- Legal name
- Hydrologic Research Center
- EIN
- 330576233
- Address
- 16870 W Bernardo Dr Ste 380, San Diego, CA, 92127-1678
- State
- California
- Mission
- Hydrologic research center's mission is to advance the science and engineering of hydrology through basic and applied research and technology transfer of activities. The organization is involved in the design, development, implementation, and testing of prototype measurement simulation and forecast operational systems. It also provides training services, including the development of... (as filed on the Form 990)
- Activity (NTEE)
- C053 Environment
- IRS classification
- 501(c)03 (tax-exempt under section 501(c)(3) where shown)
- Classified purpose
- Environment
- Size band
- 6 (IRS master file code)
- Formed
- 1993
- Principal officer
- Dr Olufemi Osidele (as named on the Form 990)
- IRS ruling date
- 1 August 1993
- Status
- Code 01 (unconditional exemption)
- Form 990 filings on record
- 8, latest 2025
- IRS Publication 78
- PC (contributions deductible)
Most connected
Longest observed on the filings
≥8years on the filingsRobert Hartman
≥6years on the filingsDr Konstantine Georgakakos
≥6years on the filingsJason Sperfslage
≥6years on the filingsRaymond BAN
Latest return
year to 30 September 2025iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 30 September 2025. US dollars, as filed.- Total assets
- $1.1m
- Total liabilities
- $579k
- Net assets or fund balances
- $540k
- Contributions and grants received
- $2.3m
- Program service revenue
- $0
- Employees
- 19
Filed finances
1 yeariTotals as filed on the IRS Form 990 (revenue and expenses), by tax year.| Tax year | Total revenue | Total expenses | Surplus or deficit |
|---|---|---|---|
| 2023 | $3m | $2.7m | $321k |
As filed on the IRS Form 990. US dollars.