"One of that small percentage who have risen to the very top of the field of endeavor" is not a question you can answer until the field is named. Nothing in the regulations names it for you.
- Every comparative criterion measures you against your field
- The regulations do not define its boundaries
- Too wide makes an ordinary record look thin
- Too narrow stops reading as a field at all
- Inconsistency across the petition undermines the whole
Where the phrase appears
The definition of extraordinary ability turns on it: "a level of expertise indicating that the individual is one of that small percentage who have risen to the very top of the field of endeavor."
So do the criteria that are explicitly comparative. The awards criterion asks about prizes "for excellence in the field of endeavor". The high salary criterion asks about remuneration "in relation to others in the field", covered in the high salary criterion. The contributions criterion asks about significance "in the field", and the guidance on citations asks whether they are high "relative to others in the field", as building a citation record sets out.
Each of those is a fraction. You control the numerator by building a record. The denominator is the field, and the petition is what sets it.
How narrow is too narrow
The EB-1A chapter does not draw the line, but the EB-1B chapter addresses the analogous question directly, and the reasoning is instructive even though the classifications differ:
"By regulatory definition, a body of specialized knowledge is larger than a very small area of specialization in which only a single course is taught or that is the subject of a very specialized dissertation. As such, it would be acceptable to find the beneficiary is an outstanding professor or researcher in particle physics rather than physics in general, as long as the petitioner has demonstrated that the claimed field is 'a body of specialized knowledge offered for study at an accredited United States university or institution of higher education.'" USCIS Policy Manual, Volume 6, Part F, Chapter 3
Two useful signals. A subfield is acceptable: particle physics rather than physics. And there is a floor: a field cannot be so narrow that it amounts to one course or one dissertation topic.
That guidance is written for EB-1B, where "academic field" is a defined term. EB-1A uses "field of endeavor" without a parallel definition, so the comparison is illustrative rather than binding. Treat it as a sense of direction, not a rule you can cite as though it governs your case.
The two failure modes
Too wide. Claiming "software" or "medicine" as your field sets a denominator you cannot plausibly sit at the top of. Every comparative exhibit then reads as unremarkable, and the final merits argument has to overcome a comparison you chose.
Too narrow. Defining the field as the exact intersection of your own work makes the top-of-field claim trivially true and therefore unpersuasive. It also invites the objection that this is not a field, it is a description of you.
The workable position is usually a recognisable specialism: one that other people identify with, that has its own venues, conferences, and awards, and that has practitioners you can be compared against. If a field has no other practitioners, it has no comparison, and comparison is what the criteria ask for.
Consistency is the real test
The commonest self-inflicted damage is a field that shifts between sections. Wide when arguing that a venue is major, narrow when arguing that a citation count is high, different again in the letters.
An officer reads the petition as one document, and the final merits determination explicitly weighs everything together, as the final merits determination describes. A field that moves to suit each exhibit is visible, and it costs credibility across the file rather than in one place.
- State the field once, early and explicitly
- Use the same wording in every criterion section and in the letters
- Choose a field with visible structure: venues, associations, awards, recognised practitioners
- Supply the comparison set, since the officer does not know your field
- Ask writers to use your framing, so the letters do not introduce a fourth version
- Check the CV agrees with the field you claim
Where the field can legitimately shift
One place the guidance does contemplate movement is over a career. The continuing-work requirement asks whether you intend to keep working in your area of extraordinary ability, and USCIS works through the athlete-to-coach case by asking whether acclaim has been sustained in the new role rather than treating the change as an automatic bar. The two requirements that are not about your evidence covers it.
The transferable point is that a change of role is a question about evidence, not a disqualification, and the further the move, the more the new role has to carry its own record.
Which field to claim, given your history and your plans, is a strategic and legal judgement. An article can tell you why the choice matters; your attorney is who you make it with.
Sources
All accessed 26 August 2026.
- 8 CFR 204.5(h)(2) and (h)(3), eCFR. The definition of extraordinary ability and the criteria that use the phrase field of endeavour.
- USCIS Policy Manual, Volume 6, Part F, Chapter 3. The guidance on how narrowly an academic field may be drawn, quoted verbatim above.
- USCIS Policy Manual, Volume 6, Part F, Chapter 2. The comparative criteria, the final merits determination, and the continuing-work discussion.
- USCIS, Employment-Based Immigration: First Preference EB-1.
The EB-1B guidance quoted above addresses the term academic field in that classification. EB-1A uses field of endeavour without an equivalent definition, so it is offered here as illustration rather than as a rule governing EB-1A.
This article describes strategy in general terms. It is not a substitute for advice from your attorney about your own case.
Frequently asked questions
Does USCIS define my field for me?
No. The regulations use the phrase field of endeavour without setting its boundaries, which is why the petition has to establish the field it is asking the officer to measure you against.
How narrow can a field be?
In the analogous EB-1B context USCIS says a body of specialised knowledge is larger than a very small area in which only a single course is taught or that is the subject of a very specialised dissertation, while accepting particle physics rather than physics in general.
Can I define my field differently for different criteria?
Inconsistency is a weakness rather than a strategy. The comparative criteria and the final merits determination are read together, and a field that shifts to suit each exhibit invites doubt about all of them.
What if I work across two fields?
That is common and it is a real drafting problem rather than a disqualification. Which framing best fits your record is a judgement to make with your attorney.
Does my field have to match my job title?
No. For the continuing-work requirement USCIS focuses on the area of expertise rather than the title, and it treats a move between related roles as a question about the evidence rather than an automatic bar.
Green Card Guide AI is not a law firm and this article is not legal advice. It describes evidence-building strategy in general terms; your attorney determines what belongs in your petition and how it's argued.