First Author vs. Corresponding Author: Who to Actually Email (2026)

You find a paper that's exactly the research direction you want to pursue, open the author list, and see four or five names with no obvious indication of which one actually runs the lab. This happens constantly, and most cold-emailing advice skips straight past it, assuming you'll simply email "the professor" without addressing how to actually identify which name on the byline that is. The author list itself tells you more than it looks like at first glance, once you know how to read the convention behind it.

Three different roles, frequently confused as one

A paper's byline actually encodes three separate pieces of information that get conflated constantly: author order (who did how much of the work), the corresponding author designation (who's officially the point of contact), and seniority (who's actually running the lab). These three things line up with each other more often than not, but not always, and the gap between them is exactly where applicants email the wrong person.

First author: usually the person who did the work, not the person leading the lab

The first author position is conventionally understood as the strongest credit for hands-on contribution, the experiments, the analysis, the bulk of the writing. In practice, this is very often a PhD student or postdoc working under a supervisor, not the lab's principal investigator. That makes the first author an excellent person to have written the paper you're reading, and a genuinely risky one to email cold if your actual goal is finding a supervisor, since a first author who was a PhD student at the time of publication may have already graduated, moved to a postdoc elsewhere, or left academia entirely by the time you're reading their work.

Last author: the conventional slot for the lab's senior researcher

In most experimental, lab-based, and many biomedical and physical science fields, the last position on the author list is conventionally reserved for the senior researcher who supervised the work, most often the principal investigator whose lab and funding actually produced the paper. This convention is strong enough in those fields that experienced researchers use it as a reliable heuristic: if you're looking for whoever actually runs the lab behind a paper, the last name on the list is frequently your best first guess, better than the first name, even though it can feel counterintuitive at first.

This convention doesn't hold everywhere, check before you rely on it

The last-author-as-senior-researcher convention is a norm in many lab-based sciences, but it isn't universal. In mathematics and a number of theoretical fields, authors are frequently listed alphabetically by surname instead, in which case position on the list tells you nothing at all about seniority or contribution. Before relying on author order to guess who's the lab lead, do a quick check: if the order looks alphabetical across multiple papers from the same group, or the field is one where that's the known norm, don't use position as your signal at all, look at institutional affiliation and grant acknowledgments instead.

Economics has the same alphabetical quirk as math, with a modern twist

Mathematics isn't the only field where author order tells you nothing about seniority. Alphabetical order is also the long-standing norm in economics, and research by economists Debraj Ray and Arthur Robson, published in the American Economic Review, found that around 85% of two-author economics papers list authors alphabetically rather than by contribution. Because that convention quietly advantages researchers whose surnames fall earlier in the alphabet, the American Economic Association now offers an author randomization tool that lets co-authors generate a genuinely random order and mark it with a small ⓡ symbol next to the author list. If you're reaching out based on an economics paper and see that symbol, or suspect the order is alphabetical rather than contribution-based, treat author position as uninformative and check institutional affiliation and funding acknowledgments instead, exactly as you would in mathematics.

Preprints and arXiv papers often skip formal corresponding-author marking entirely

If you're reading a preprint on arXiv, bioRxiv, or a similar server rather than a peer-reviewed journal version, don't expect to find a clearly marked corresponding author at all, that designation is typically added during the journal's formal submission and review process, which a preprint hasn't necessarily gone through yet, or may never go through if it stays as a preprint. In that case, fall back on the same signals: last-author position where that convention applies to the field, institutional affiliation, and whichever author's contact details actually appear in the document, often in a footnote on the first page rather than prominently displayed near the author list itself.

Corresponding author: the one role actually designed to be contactable

The corresponding author is whoever the paper's authors and the journal formally designated as the point of contact for questions, comments, and follow-up about the work, marked with a specific symbol or note in most published papers and journal listings. This role exists precisely so that a reader with a genuine question has a reliable way to reach someone, which makes it the single most dependable piece of authorship metadata for your purposes. It's very often the senior researcher, since a lab head is usually the one committing to handle ongoing correspondence about their group's work for years after publication, but check it directly rather than assuming, since it isn't automatically the same person as the last author in every paper.

Put the three signals together before you decide who to email

In practice, cross-reference all three: who's listed as corresponding author, who occupies the last-author position (if the field follows that convention), and whose institutional affiliation and grant acknowledgment section suggest they're the one who actually secured the funding behind the work. When all three point to the same name, that's a strong, reliable signal. When they diverge, for example when a former student is still listed as corresponding author on an older paper, favor the last author or the grant acknowledgment, since institutional email addresses tied to a departed student are the most likely to have gone stale.

Check the publication date before you trust any of this

None of these signals matter if the paper itself is old. A paper published five or six years ago may have been led by a PhD student who's now a faculty member somewhere else entirely, running their own lab with completely different current research. Always check how recent the paper is, and separately verify that the senior author you land on is still actively publishing in the same area right now, not just that they were several years ago. This is exactly what our guide on reading a Google Scholar profile properly is built to help you verify, a full publication history including their most recent output, not just the one paper that first caught your attention.

Once you've identified the right person, write the email around that context

Having correctly identified the lab lead rather than a departed co-author doesn't change how the email itself should be structured, it just means it actually reaches someone positioned to respond. Our guide on writing a research interest statement for a cold email covers grounding your interest in that specific paper once you've confirmed you're addressing it to the person who can actually act on it.

Figuring out author order, checking who's still active, and cross-referencing institutional pages for a current email address is exactly the kind of manual research that eats hours once you're doing it across dozens of papers and professors. GradScoutFunding searches professors by field and country directly, so you're starting from the current lab lead rather than reverse-engineering a byline, confirms they're actively publishing right now, and finds a verified email before drafting a personalized outreach email grounded in their real recent paper for you to review and send yourself. Try the professor search tool free, your first 2 credits cost nothing.

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