Overview
The rules of evidence decide whether an opinion is heard. The rules of civil procedure, and a handful of ethics rules and contract terms, decide almost everything else: who the expert works for, what may be discovered about the work, who pays for which parts of it, what the report has to contain, and what happens when a deadline passes without a disclosure.
That material is organized here as an engagement runs — finding, terms, the record, testimony — because the order is where the difficulty lives. Each stage narrows what the stage before it can still decide, and by the time a problem becomes visible it is usually a problem created several stages earlier.
Before retention
The first group covers everything that happens before anyone is engaged: how experts are actually found, how a candidate is vetted, how the market of directories and referral services works, and how a conflict check is run.
Two facts shape all of it. The first is that the federal disclosure rule is already a specification for the search. FRCP 26(a)(2)(B) requires a report to contain the witness’s qualifications including all publications authored in the previous 10 years, a list of all other cases in which the witness testified at trial or by deposition in the previous 4 years, and a statement of the compensation to be paid. There is no reason to wait for the deadline to ask for material the rule will demand anyway.
The second is that the channels through which experts are found are businesses with different people paying, and none of them, by design, answers the question a buyer actually has. A listing directory is bought by the expert. A broker is paid by the law firm and keeps the difference between what the firm pays and what the expert receives. A subscription platform is paid by the firm for curation whose basis is not disclosed. None of the three is disreputable, and none of them is a vetting. The route that carries the most information — prior testimony, published opinions, motions and briefs naming the candidate — is the one least used, and a motion in limine directed at a candidate is opposing counsel’s free memorandum on their weaknesses.
Conflicts belong here too, and they work differently than lawyer conflicts. There is no expert analogue to Model Rule 1.7. What disqualifies an expert is confidential information: courts ask whether it was objectively reasonable for a party to conclude that a confidential relationship existed and whether confidential or privileged information actually passed, and both must be answered yes. That structure is deliberate — it stops a party from tying up a field’s available experts by making token contact with all of them.
The terms
The second group is money and paperwork: what published fee surveys actually measured, how an engagement is structured, who pays for expert discovery, and what an engagement letter has to answer.
Three points recur across all of it. Every published US figure on expert rates comes from a company that sells into this market, and every one of them is a self-selected sample of self-reported asking prices rather than audited billings; the figures are useful as an order of magnitude and as a description of structure, and are not a benchmark against which a quotation can be judged. The terms around the rate — retainer form, invoicing cadence, appearance minimums, cancellation windows, treatment of travel — do more to determine what an engagement costs than the rate does. And the belief that the other side pays for the expert is wrong in a specific and expensive way: FRCP 26(b)(4)(E)(i) shifts a reasonable fee only for time spent responding to discovery under Rule 26(b)(4)(A) or (D), which leaves review, analysis, the report, trial preparation and trial testimony with the retaining party.
One term is not negotiable in substance. Compensation for a testifying expert is not contingent on the outcome, and none of the fee terms are confidential: the compensation statement is a required content of the report, and communications relating to compensation are carved out of the protection given to attorney–expert communications.
The record
The third group covers what gets created and what gets produced: the report itself, the disclosure rules that govern it, and the treatment of drafts and communications.
The most consequential word in this part of the rules is considered. FRCP 26(a)(2)(B)(ii) requires disclosure of the facts or data considered by the witness, and the 2010 Advisory Committee note reads that as extending to any material with factual ingredients, from any source, and expressly not only to material relied upon. An expert who read a study and rejected it has considered it.
Against that, the 2010 amendments extended work-product protection to draft reports and to attorney–expert communications. The protection is real and routinely overstated. It is work-product protection rather than privilege, so it is qualified; it carries three express exceptions; it covers communications only with witnesses required to write a report; and it does not reach the expert’s own notes, communications with anyone other than retaining counsel, or testing records. Several states never adopted it at all.
After disclosure
The fourth group is examination: the deposition, rebuttal reports, and testimony at trial. By the time these arrive the record is largely fixed. A deposition is conducted on a report that has been served, a rebuttal is confined to contradicting evidence on the same subject matter rather than carrying the disclosing party’s own case, and trial testimony is delivered against a transcript that already exists.
Which is the theme of the whole category. The work that determines how these stages go was done months earlier, by someone deciding what the expert was for, what they were sent, and how much time they were given.
Published