The CTBTO Mentoring Programme
What it is
The CTBTO Mentoring Programme is a structured, time-bound mentoring cycle aimed at early-career women in STEM, nuclear non-proliferation, and disarmament. It pairs mentees with experienced professionals connected to the CTBTO’s work and combines one-on-one mentoring with several thematic group sessions that explain how the Organization operates and how technical expertise supports the Comprehensive Nuclear-Test-Ban Treaty (CTBT).
Launched in 2022, the programme is designed to offer unique and practical development opportunities for women in areas where they remain under-represented, to enhance their competitiveness in these fields. It gives mentees space to set goals, ask direct questions and navigate career choices with greater confidence, while gaining a clearer understanding of the skills and pathways underpinning nuclear-test-ban verification efforts.
Since its inception, the CTBTO has connected early-career women with technical experts from across the Organization, as well as with specialists in National Data Centres (NDCs), national laboratories and institutions that contribute directly to the CTBTO’s mission to ban nuclear weapon test explosions.
The initiative is currently funded by the European Union.
Who takes part
The programme is intended for early-career women up to 30 years of age from CTBTO States Signatories, with academic or professional backgrounds in STEM, nuclear non-proliferation and disarmament.
Mentees across recent cohorts have included:
- Master’s and PhD students
- Early-career professionals in research institutes, regulatory bodies, and technical organizations
- Specialists connected to National Data Centres (NDCs) or institutions that contribute to the CTBTO’s mission
Participants come from a range of disciplines, most commonly technical fields such as physics, nuclear engineering, geology, radiation protection, environmental science and data analysis, alongside nuclear policy-related studies including international security, non-proliferation and international relations.
Why it matters
Many STEM, nuclear non-proliferation and disarmament fields continue to see women under-represented, particularly in senior and highly specialised roles. The imbalance is most evident where access to professional networks, mentorship and international exposure is limited.
By supporting women at earlier stages of their careers across all six CTBTO geographical regions, with particular attention given to under-represented regions, the programme advances gender equality and helps build a stronger pipeline of qualified women for roles in these fields worldwide. In doing so, it also reinforces capacity building connected to the CTBT’s verification regime.
The mentoring relationship is mutually beneficial. This intergenerational exchange offers fresh perspectives on both sides and creates space for continued personal and professional growth.
How the programme works
The programme is built around two complementary strands.
1) One-on-one mentoring and personalised guidance
Each mentee is paired with a mentor for structured goal-oriented conversations across the programme cycle. Mentors are experienced professionals drawn from within the CTBTO, including areas connected to the International Monitoring System (IMS), the International Data Centre (IDC) and On-Site Inspection (OSI), as well as experts from NDCs and national laboratories or institutions in States Signatories.
Mentoring focuses on real questions and real decisions, including:
- Clarifying career direction and next steps
- Building confidence in professional settings
- Understanding technical pathways and workplace expectations
- Talking through challenges, opportunities and trade-offs
2) Group sessions and professional development
Alongside mentoring, mentees join group sessions led by CTBTO staff. These sessions are designed to deepen their knowledge of the Organization’s mission and strengthen the professional skills needed to contribute to the work of the Organization in future.
These tailored sessions include:
- Division-led briefings that explain how verification functions in practice
- Interactive exercises and simulations
- Structured case studies, including “deep dive” sessions delivered by technical Divisions
- Communications training led by the Public Information (PI) Section
- A “Recruitment Bootcamp” led by the Human Resources Services (HRS) Section on successfully navigating selection processes at international organizations
The programme is delivered in a hybrid format. All group sessions take place online. Where possible, mentoring pairs based in the same location are encouraged to meet in person, including at the CTBTO’s headquarters in Vienna. In some cases, pairs are matched based on a shared native language, in addition to the programme’s working language of English, to promote multilingualism and foster deeper personal connections.
Track record and impact
The programme has grown steadily since it began.
- 2022 (pilot): 12 mentees. Developed in partnership with the CTBTO Youth Group (CYG) and in collaboration with the International Gender Champions (IGC) network.
- 2023 (second edition): 13 mentees. Five attended an introductory OSI course in Vienna, supported by their Permanent Missions.
- 2024 (third edition): 26 mentees. Expanded to include mentors from NDCs and national laboratories or institutions that contribute to the CTBTO’s mission.
- 2025 (fourth edition): 40 mentees. 12 attended the Science and Technology Conference and were given a private tour of the IDC Operations Centre.
- Two former mentees were successfully recruited as interns at the Organization for the first time through a competitive selection process within the IDC and OSI Divisions.
Apply for the next cohort
Application dates
- Call opened 23 February 2026
- Deadline 31 March 2026
Programme period
May to September 2026: The cycle includes a launch, thematic Division-led sessions and a closing event attended by the CTBTO Executive Secretary, subject to availability.
If you are applying, it is helpful to be clear about what you hope to gain from the mentoring experience: the skills you would like to develop, the questions you would like to explore and how you aim to contribute to the work of the CTBTO.
CTBTO States Signatories, NDCs and partner institutions can support the programme by encouraging strong candidates to apply and by connecting the CTBTO with potential mentors and technical
10 mentees supported by European Union to attend SnT2025
Mentor showing mentees how evidence is gathered during on-site inspection
Mentees meeting Ethiopia’s first female president, Sahle-Work Zewde
Mentees at session led by International Data Centre (IDC) staff at Operations Centre
In-person mentoring session at CTBTO’s headquarters in Vienna
Opening session of 2025 CTBTO Mentoring Programme
CTBTO Executive Secretary Robert Floyd welcoming first two mentees hired at CTBTO as interns