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US nonprofit · EIN 311129675 · Brentwood, TNiSource and licenceOrganisation record IRS Exempt Organizations Business Master File (EIN 311129675) - NTEE activity code, address.Board and officers IRS Form 990 annual filings, Part VII (directors, trustees, officers, key employees), read year by year to observe time served.Latest return IRS Form 990 series e-file data - 990 for the year to 31 December 2024: assets, liabilities, staff, website, telephone, pay.Finances by year IRS Form 990 e-file data - total revenue and total expenses by tax year.Renewal outlook Computed by Governance Register from the observed filing history and filed revenue. Not a statement that the organisation is recruiting.Deductibility IRS Publication 78 data (code PC), downloaded 18 October 2026.Licence US Federal Government public domain.How we handle data

International Society for Traumatic Stress Studies

Donations deductible
Revenue
$1.9m
year to 31 December 2024
Expenses
$1.3m
year to 31 December 2024
Total assets
$1.4m
$206k liabilities
Net assets
$1.2m
assets less liabilities
Directors and trustees
23
4.8 years on average
Staff
0
365 volunteers
Left since last filing
0
no seats appear to have opened
Officers and senior staff
2
named in Part VII
How am I connected?

International Society for Traumatic Stress Studies' network

23 peoplei23 people on this map.The large node is the subject of this page. Solid lines are what the register itself records (23). Form 990 filings give names without a person identifier; SEC insider filings carry a CIK.

The board

23 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.Time served and departures are observed across annual filings. Observed time served is a lower bound - a member may have joined before the first year on record. The organisation reported 21 voting members of its governing body on its latest Form 990 Part VI, which matches the board listed here.
NameRole as filedSinceOn the board
Andrea J PhelpsPresident-Elect2020
6 yrs
Angela Nickerson PHD (also filed as Angela Nickerson)Immediate Past President/Member2018
8 yrs
Arieh ShalevBoard Member2024
2 yrs
Bita Ghafoori PHD (also filed as Bita Ghafoori)Board Member2018
8 yrs
Brian N SmithVice President/Treasurer2020
6 yrs
Briana Woods-Jaeger PHD (also filed as Briana Woods-Jaeger)Board Member2022
4 yrs
Christian Kristensen PHD (also filed as Christian Kristensen)Board Member2019
7 yrs
Evaldas KazlauskasBoard Member2024
2 yrs
Iris EngelhardBoard Member2024
2 yrs
Jaimie GradusBoard Member2024
2 yrs
Jana D Javakhishvili PHD (also filed as Jana D Javakhishvili)Board Member2023
3 yrs
Jennifer SumnerCompany secretary2024
2 yrs
Jinhee HyunBoard Member/Secretary2020
6 yrs
Judith BassBoard Member2024
2 yrs
Marit Sijbrandij PHD (also filed as Marit Sijbrandij)President Elect2018
8 yrs
Masaya ITOBoard Member2024
2 yrs
Michele Bedard-Gilligan PHD (also filed as Michele Bedard-Gilligan)Board Member2023
3 yrs
Nicole Nugent PHD (also filed as Nicole Nugent)Board Member2019
7 yrs
Rachel Hiller PHD (also filed as Rachel Hiller)Treasurer/Member2022
4 yrs
Rachel LiebmanBoard Member2024
2 yrs
Sonya Norman PHD (also filed as Sonya Norman)Board Member2022
4 yrs
Soraya SeedatPresident2024
2 yrs
Synne Stensland MD (also filed as Synne Stensland)Board Member2018
8 yrs
Under 5 years5 to 6 years6 years or moreShow all 23 →

Officers and senior leadership

2 listediNamed in Part VII as officers, key employees or highest-compensated staff - not board members, shown for completeness.
NameTitle as filedOn the filings
Diane Elmore Borbon PHD MPHExecutive Directorsince 2022
Rick KoepkeExecutive Directorsince 2018

Pay and hours

year to 31 December 2024iFrom 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.
NameTitle as filedHours a weekPay from the organisationRelated organisationsOther
Judith BassBoard Member1$0
Michele Bedard-GilliganBoard Member0.5$0
Iris EngelhardBoard Member0.5$0
Andrea J PhelpsPresident-Elect5$0
Bita GhafooriBoard Member1$0
Jaimie GradusBoard Member0.5$0
Jinhee HyunBoard Member/Secretary0.5$0
Angela NickersonImmediate Past President/Member5$0
Masaya ItoBoard Member0.5$0
Jana D JavakhishviliBoard Member1$0
Evaldas KazlauskasBoard Member0.5$0
Christian KristensenBoard Member1$0
Rachel LiebmanBoard Member0.5$0
Sonya NormanBoard Member2$0
Rachel HillerTreasurer/Member3$0
Brian N SmithVice President/Treasurer3$0
Jennifer SumnerSecretary2$0
Nicole NugentBoard Member0.05$0
Arieh ShalevBoard Member0.05$0
Briana Woods-JaegerBoard Member0.5$0
Soraya SeedatPresident10$0
Marit SijbrandijPresident Elect10$0
Synne StenslandBoard Member0.5$0
Diane Elmore BorbonExecutive Director30$0

No pay was reported for anyone in Part VII on this return.

About

Legal name
International Society for Traumatic Stress Studies
EIN
311129675
Address
5034 Thoroughbred Ln Ste A, Brentwood, TN, 37027-4231
State
Tennessee
Mission
Istss is an international multidisciplinary, professional membership organization that promotes advancement and exchange of knowledge about severe stress and trauma. This knowledge includes understanding the scope and consequences of traumatic exposure, preventing traumatic events and ameliorating their consequences, and advocating for the field of traumatic stress. (as filed on the Form 990)
Activity (NTEE)
F71Z Mental health and crisis intervention
IRS classification
501(c)03 (tax-exempt under section 501(c)(3) where shown)
Classified purpose
Mental Health & Crisis Intervention
Size band
6 (IRS master file code)
Formed
1985
Principal officer
Diane Elmore Borbon (as named on the Form 990)
IRS ruling date
1 March 1986
Status
Code 01 (unconditional exemption)
Form 990 filings on record
6, latest 2024
IRS Publication 78
PC (contributions deductible)

Most connected

Longest observed on the filings

≥8years on the filingsAngela Nickerson PHD
≥8years on the filingsBita Ghafoori PHD
≥8years on the filingsMarit Sijbrandij PHD
≥8years on the filingsSynne Stensland MD

Latest return

year to 31 December 2024iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 31 December 2024. US dollars, as filed.
Total assets
$1.4m
Total liabilities
$206k
Net assets or fund balances
$1.2m
Contributions and grants received
$25k
Program service revenue
$1.2m
Grants and similar paid out
$5k
Employees
0
Volunteers
365

Filed finances

1 yeariTotals as filed on the IRS Form 990 (revenue and expenses), by tax year.
Tax yearTotal revenueTotal expensesSurplus or deficit
2024$1.9m$1.3m$617k

As filed on the IRS Form 990. US dollars.