Clay Postdoctoral Fellowship 2027: $87,500 Stipend and $18,000 Research Budget at CfA
The Center for Astrophysics Clay Postdoctoral Fellowship supports independent early-career astrophysics research with a four-year appointment, annual stipend, research budget, benefits, relocation support, and access to CfA facilities.
Clay Postdoctoral Fellowship 2027: $87,500 Stipend and $18,000 Research Budget at CfA
The Clay Postdoctoral Fellowship at the Center for Astrophysics | Harvard & Smithsonian is open for the 2027 appointment. It is designed for an early-career astrophysics researcher who wants substantial independence, access to major facilities, and time to develop an ambitious research program. The fellowship is based in Cambridge, Massachusetts, and begins on September 1, 2027.
The financial package is unusually clear. The fellowship provides an annual stipend of $87,500, with an annual cost-of-living adjustment, and an $18,000 research budget for each year. It also funds health and dental benefits for the fellow and eligible dependents at no cost to the fellow, includes a one-time relocation allowance, and offers a four-year appointment, with the fourth year contingent on satisfactory progress.
The application is not a generic postdoctoral packet. The Center for Astrophysics asks for a curriculum vitae with an ORCID identifier and up to three Unified Astronomy Thesaurus keywords, a publication list, short impact-and-relevance descriptions for up to four publications, and a five-page research overview. The overview must include both previous and current research and a research proposal that explains its relevance to the Center for Astrophysics. Applications must be submitted online through AJO by 5 p.m. Boston time on October 15, 2026.
Key details
| Detail | Information |
|---|---|
| Opportunity | Clay Postdoctoral Fellowship |
| 2027 start date | September 1, 2027 |
| Application deadline | October 15, 2026, at 5 p.m. Boston time |
| Appointment | Four years, with the fourth year dependent on satisfactory progress |
| Stipend | $87,500, with an annual cost-of-living adjustment |
| Research support | $18,000 research budget each year |
| Additional support | Health and dental benefits, including dependents where applicable, plus a one-time relocation allowance |
| Location | Cambridge, Massachusetts, United States |
| Research areas | Theory, observation, instrumentation, engineering, laboratory, and experimental astrophysics |
| Application route | Online AJO application under the program name “Clay Postdoctoral Fellowships” |
| Official source | [Center for Astrophysics |
What the Clay Fellowship offers
The central benefit is research independence. The Center describes Clay Fellows as independent researchers with access to the full range of CfA expertise and facilities. That distinction matters for applicants comparing ordinary postdoctoral employment with a named fellowship. The opportunity is intended to give a fellow room to define and lead a research direction, while still providing a large scientific community and technical infrastructure.
The annual $18,000 research budget is separate from the stipend. The official page does not list every allowable expense, so applicants should not assume that it can be used for any personal or project cost. It is best understood as research support that can be discussed with the fellowship coordinator or future host. The Center also advertises opportunities to develop instrumentation with experienced technical and engineering staff, seek CfA-allocated observing time as a principal investigator, organize workshops or topical discussions, host scientific visitors, and participate in education and outreach.
Who this opportunity fits
The fellowship is aimed at researchers whose work falls within theory, observation, instrumentation, engineering, laboratory astrophysics, or experimental astrophysics. The Center says successful candidates will be outstanding researchers with demonstrated promise. That wording makes evidence of research direction important: the application should make it easy to see what the applicant has already contributed and what new work they are ready to lead.
Applicants must have no more than 42 months of equivalent full-time post-PhD research experience at the fellowship start date of September 1, 2027. The calculation is based on equivalent full-time research experience, not simply the number of calendar months since graduation. The Center specifically says that time taken for family leave, career duties, illness, or other career gaps does not count toward the 42-month total. Those circumstances should be noted in the CV.
The opportunity is open to qualified applicants who are English-speaking citizens from any nation. The strongest fit is a researcher who can work independently but also has a clear reason to collaborate with CfA scientists, use its facilities, participate in its intellectual community, or contribute to its education and outreach activity.
The page also notes that only SAO scientists can officially host Clay Postdoctoral Fellows. This is a practical eligibility and planning issue. A prospective applicant should identify relevant SAO scientists early, understand whether the proposed work fits their expertise, and make the Center for Astrophysics connection concrete in the research overview. Do not treat a general interest in Harvard or Smithsonian facilities as a substitute for a credible host and collaboration plan.
Application materials and format
All application materials must be uploaded as PDFs. The required packet is compact, so compliance with the format matters. The Center specifically says not to include reprints, preprints, a cover letter, cover sheets, or other extra materials. Adding unsolicited documents can make the application look inattentive to instructions, even if those documents are scientifically useful in another context.
The CV must include an ORCID identifier and up to three keywords from the Unified Astronomy Thesaurus. Choose terms that accurately describe the research identity presented in the proposal. The keyword limit is not an invitation to list every method or object studied. A small, coherent set helps a reader understand the applicant’s field quickly and may make the proposed work easier to place within the Center’s research community.
The publication list should be complete and easy to scan. For up to four publications, the applicant must provide a description of no more than 100 words for each publication explaining its impact and relevance to the field. These descriptions can cover work where the applicant was not the lead author, provided the applicant was the primary contributor. That is a useful opening for applicants whose contribution is methodological, instrumental, computational, or collaborative rather than captured by author order.
The research overview is limited to five pages total, including tables and figures. It must contain two named sections: “Summary of Previous and Current Research” and “Research Proposal.” References go at the end and do not count toward the five-page limit. The proposal must include relevance to the Center for Astrophysics | Harvard & Smithsonian. Since the limit includes tables and figures, every visual element should earn its space by clarifying the scientific argument.
Timeline and deadline
Applications opened on August 17, 2026. The deadline is October 15, 2026, at 5 p.m. Boston, Massachusetts time. Convert that deadline to your own time zone before the final day; an application that arrives after the stated time may not be considered.
References are handled differently from many fellowship applications. Applicants should not submit references unless contacted by the Fellowship Coordinator. The Center says references will be contacted by November 5, 2026, and asked to submit letters to the coordinator by November 17, 2026, at 5 p.m. Eastern Daylight Time. References will be requested only for a subset of applicants. This means you should be ready to provide accurate referee details if the application form asks for them, but you should not independently send letters or ask referees to submit them unless the Center contacts them.
Selection is scheduled for December 15, 2026. The fellowship starts September 1, 2027. These dates give applicants a long gap between selection and arrival, but they do not make it sensible to wait for a decision before thinking about relocation, work authorization, or discussions with possible hosts. Those practical questions can take time, particularly for an international applicant.
How to prepare a stronger proposal
Start with the scientific question, then connect it to the Center. A proposal that merely names impressive telescopes or facilities is not enough. Explain what problem the work addresses, why the proposed approach is appropriate, what the applicant will personally lead, and which CfA expertise or resource makes the project stronger. The relevance section should read as part of the scientific plan, not as a paragraph added at the end for compliance.
Use the previous-and-current research section to establish continuity and growth. The goal is not to repeat the entire CV. Select the work that demonstrates the skills needed for the proposed project, then make the progression visible. If the new project changes methods or research area, explain why the transition is credible and what preparation supports it.
Treat the four publication descriptions as contribution statements. State the problem, the applicant’s role, the result, and why the result matters. Where author order does not show the contribution, describe the specific responsibility directly. Avoid spending the full 100 words on background that a publication title already conveys.
Build the five-page proposal around decisions a reader can evaluate. Include a focused question, a defensible method, a realistic sequence of work, and meaningful outcomes. Figures and tables should make a method or result easier to understand; they should not be decorative. References can extend beyond the five-page limit, but the main argument still needs to stand on its own within the allowed pages.
Ask one scientist outside the immediate specialty to read the draft for clarity and one specialist to test its assumptions, feasibility, and connection to the CfA. Leave time to revise the PDF and check that the final page count includes every figure and table.
Common mistakes to avoid
The first mistake is missing the exact submission route. The Center says only online applications submitted through AJO will be considered, and the program name is “Clay Postdoctoral Fellowships.” Confirm that the application is being submitted to the correct program rather than to a neighboring CfA postdoctoral posting.
The second is miscalculating post-PhD experience. Use the September 1, 2027 start date and the equivalent full-time research standard. Account for qualifying career gaps as the Center instructs and explain them in the CV. If your situation is unusual, contact the Fellowship Coordinator before the deadline.
The third is sending extra documents. Reprints, preprints, cover letters, and cover sheets are expressly excluded by the official instructions. Keep the packet to the requested materials unless the Center gives you different instructions in writing.
The fourth is treating the research budget as personal income. The confirmed amount is an $18,000 annual research budget, not an extra stipend. Ask how proposed expenses would be handled before relying on it for a specific purchase, trip, or appointment.
The fifth is naming a host without checking the SAO-host rule. The fellowship encourages collaboration across the CfA, but only SAO scientists can officially host Clay Fellows for administrative purposes. Check the host list and make the connection in the proposal.
Finally, do not submit a generic proposal that could be sent to any observatory. The Center’s strongest evidence of fit will come from a precise explanation of why its people, facilities, and interdisciplinary setting matter to this project.
Frequently asked questions
Is the fellowship open now?
Yes. The Center says applications opened August 17, 2026, and are due October 15, 2026, at 5 p.m. Boston time.
How much does it pay?
The official package lists an $87,500 stipend with an annual cost-of-living adjustment and an $18,000 research budget for each year. It also lists health and dental benefits, including dependents where applicable, at no cost to the fellow, plus a one-time relocation allowance.
How long is the appointment?
It is a four-year appointment. The fourth year is contingent on satisfactory progress.
Can an international researcher apply?
The Center says the opportunity is open to qualified English-speaking citizens from any nation. Applicants should still confirm any practical immigration or employment requirements with the fellowship coordinator.
Are recommendation letters required with the initial application?
No letters should be submitted unless the Fellowship Coordinator contacts the applicant’s references. The Center says references will be contacted for only a subset of applicants.
What is the page limit for the research overview?
The overview is limited to five pages total, including tables and figures. References are placed at the end and do not count toward that limit.
Can the Clay Fellowship be combined with another fellowship?
No. The Center states that the Clay Fellowship is not eligible to be combined with other fellowships.
Next steps and official links
A suitable applicant should first check the 42-month experience rule and September 1, 2027 start date. Next, identify a relevant SAO scientist who could officially host the work and verify that the proposed project genuinely fits the CfA. Then assemble the CV, ORCID and Unified Astronomy Thesaurus keywords, publication list, four publication descriptions if applicable, and five-page research overview as PDFs.
Before submitting, check the AJO program name, the Boston-time deadline, the page count, and the ban on extra documents. Keep a copy of the submitted packet and note any confirmation number or receipt generated by the application system. Questions should be directed to the Fellowship Coordinator listed on the official page.
The official Clay Postdoctoral Fellowship page is the controlling source for the 2027 deadline, benefits, eligibility, host arrangements, and document instructions. The Center also links to the AAS posting for application instructions and to the list of SAO scientists who can officially host Clay Postdoctoral Fellows. Check those links again before submitting because application instructions and administrative details can change during an open cycle.