Expert Disclosures

Expert Disclosures

Rule 26(a)(2), titled Disclosure of Expert Testimony, adds a second wave of required disclosure for the experts a party may use at trial.¹ That wave covers the identity of each expert, the opinions the expert will express, and the basis for those opinions, and the court normally sets its timing.² It sits on top of the initial disclosures and has its own trigger: a witness the party may use at trial to present expert evidence, such as a physician’s opinion on what caused an injury or an engineer’s opinion on why a part failed.³

Experts get a separate regime because an opponent cannot answer an expert opinion cold. A witness who saw a collision reports what the witness perceived, and the opponent can prepare from a name and a subject. An expert’s opinion rests on technical methods and assumptions that the opponent often cannot evaluate on short notice. Told only that an engineer will testify about a braking system, the opponent cannot retain its own engineer or build a cross-examination that tests the opinion. Disclosure must therefore reveal who will give the opinion and what the opinion is, early enough for a real response.

Three questions organize this section: which testifying experts a party must identify, how much it must reveal about each, and when the disclosure is due. The rule answers the second question differently for different kinds of expert. The subsections therefore move from the duty to identify every testifying expert, to experts who must report, to experts who need not, and finally to deadlines.

Identifying Testifying Experts

Rule 26(a)(2)(A) sets the floor of the expert stage: in addition to the disclosures required by Rule 26(a)(1), a party must disclose to the other parties the identity of any witness it may use at trial to present evidence under Federal Rule of Evidence 702, 703, or 705.⁴ This layer asks for a single thing, a name, and the later subsections take up how much more each kind of expert owes. The rule states the duty directly (“a party must disclose”), so it does not wait on an interrogatory.

The trigger has three parts, and each does separate work. The words “in addition to” keep this duty distinct from the initial disclosures, so the two are analyzed separately. The phrase “may use” is contingent: the party need not be certain it will call the witness, only that calling the witness is a real possibility. The last phrase defines the testimony that counts, which is evidence under Evidence Rules 702, 703, and 705, the rules on expert opinion testimony. A witness who will describe only what the witness personally saw and did gives lay testimony, and this rule does not reach that witness.

Crawford v. ITW Food Equip. Grp., LLC explains why the rule asks for the name early. The drafters meant to give the opposing party “a reasonable opportunity to prepare for effective cross examination and perhaps arrange for expert testimony from [their own] witnesses,” and they required disclosure “sufficiently in advance of trial” to make that possible.⁵ Both halves of that purpose begin with a name. Cross-examination is built from the expert’s training, publications, and earlier testimony, and none of that can be gathered until the expert is identified. Rebuttal testimony requires a qualified expert who must study the materials and form an opinion, and that takes time.

For any doctor, engineer, or accountant in a fact pattern, the question is the same: does the party plan to put this person on the stand to give an opinion that rests on specialized knowledge? The witness’s label and the way the witness came into the case do not answer it. A retained expert and an unretained one pose the same problem for the opponent, an opinion it cannot test on short notice. If the duty turned on retention, a party could avoid it by relying on an expert it never formally hired.

The surgeon needs no engagement letter to be covered, because the duty attaches to the plan to present the opinion. Whether the surgeon must also supply a written report is a separate question for the next two subsections. The identity duty is the floor of the expert regime, and it applies to every testifying expert.

The same trigger excludes a party’s consultant. An expert who helps a party evaluate the case, test a theory, or advise the lawyers, and whom the party will not call, is not a witness the party may use at trial to present expert evidence, so the rule’s text does not require the party to name that person.⁶ The consultant’s status turns on the party’s plan for trial, and a change of plan changes the category.

Students make two errors that grow from the same misreading. One equates “expert” with “hired expert” and excuses the unretained treating physician. The other treats every specialist a party has consulted as a witness whose name must be disclosed and demands the consultant’s identity. Both ask how the witness relates to the party, when the rule asks what the witness will do at trial. This subsection does not fix the deadline for the name. The court normally sets it, and the last subsection supplies the default that applies when nobody has.⁷

Experts Who Must Report

Rule 26(a)(2)(B) adds a written report for one group of testifying experts. Unless the parties stipulate or the court orders otherwise, the disclosure must be accompanied by a report, prepared and signed by the witness, when the witness is retained or specially employed to provide expert testimony in the case or is the party’s employee and has duties that regularly involve giving expert testimony.⁹ The report belongs to the second wave of disclosure, which reaches the experts’ opinions and the bases for them.¹⁰ The identity duty supplies the name, and the report supplies the opinions and reasoning, but only for the two kinds of expert the rule names.

Each category has its own logic. A witness retained or specially employed for the case holds opinions that exist because of the lawsuit: the party sought the expert out, framed the questions, and will rely on the answers at trial. The opponent cannot prepare a cross-examination or find a rebuttal expert without knowing those opinions, and a complete written account delivered in advance supplies that knowledge.¹¹ The second category covers the employee-expert, so a party cannot avoid the report by assigning the testimony to an employee whose job is to appear as an expert. The word regularly sets the boundary. A staff engineer asked on a single occasion to testify about a product the engineer helped design does not have duties that regularly involve giving expert testimony, while an employee whose position includes testifying as part of the job does.

Set that engineer beside the homeowner’s surgeon from the last subsection, who will testify, from medical training, that the fall caused the fracture. Nobody retained the surgeon for the lawsuit, and a surgeon’s duties do not include giving expert testimony, so neither category applies and no written report is required. The surgeon is still a testifying expert, and the rule substitutes a lighter disclosure that states the subject matter on which the surgeon is expected to present expert evidence and a summary of the facts and opinions to which the surgeon is expected to testify.¹² The engineer and the surgeon give the same kind of testimony, so the difference lies in how each came to the case. Ask of any witness whether the opinion was commissioned for the litigation or whether the witness’s job regularly involves testifying. The next subsection teaches the lighter disclosure in detail.

The report must be prepared and signed by the witness.¹³ It is the expert’s own statement of what the expert will say, and the signature ties the expert personally to the page. The opening words of the rule let a stipulation or a court order change the requirement, so parties who agree that a particular witness need not report may say so, and a judge may order something different.

One required item is a complete statement of all opinions the witness will express and the basis and reasons for them.¹⁴ Each word does work. Complete and all make the report the full inventory of the witness’s opinions, so an opinion the expert plans to give at trial belongs in it. Basis and reasons require the expert to say why each opinion follows, so a bare conclusion that the other car was speeding leaves the item unsatisfied. Cross-examination attacks the path from facts to conclusion. A report that lists conclusions while withholding the reasoning, or that omits an opinion the expert intends to give, denies the opponent the opportunity the drafters meant to provide.¹⁵

Another required item is a list of all other cases in which, during the previous 4 years, the witness testified as an expert at trial or by deposition.¹⁶ The list lets the opponent check the expert’s record, since earlier testimony shows what positions the expert has taken and whether those positions fit the opinion offered now. The text limits the item twice. It reaches only testimony at trial or by deposition, so a case in which the expert was consulted but never testified does not appear, and it looks back 4 years, so the rest of a long career stays off the page. The rule lists other required contents as well, which this unit does not develop.

A party that omits a required report, or serves one with gaps, risks losing the testimony. The drafters paired the disclosure requirements with a “self-executing” “automatic sanction” of exclusion in Rule 37(c), intended as “a strong inducement for disclosure of material that the disclosing party would expect to use as evidence, whether at trial, at a hearing, or on a motion.”¹⁷ The later section on consequences of nondisclosure takes up how courts apply that sanction.

Experts Without Reports

Rule 26(a)(2)(C) supplies a lighter alternative to the report. Unless the parties stipulate or the court orders otherwise, when a testifying expert is not required to provide a written report, the disclosure must state two things: the subject matter on which the witness is expected to present evidence under Federal Rule of Evidence 702, 703, or 705, and a summary of the facts and opinions to which the witness is expected to testify.¹⁹ The word and joins the two items, so a disclosure needs both. This disclosure supplements the baseline duty to name every testifying expert, so the witness is named under that duty and described under this one.²⁰

This group is defined by exclusion. The last subsection identified two kinds of testifying expert who must report, the witness retained or specially employed for the case and the party’s employee whose duties regularly involve giving expert testimony. Every other testifying expert belongs here. A treating physician whom no one retained for the lawsuit illustrates the category, because the physician formed opinions in treating the patient and not for the litigation. The label “expert” and the witness’s profession decide nothing. What decides the category is how the witness came to the case.

The lighter disclosure tracks who controls the witness. A retained expert’s opinions exist because of the lawsuit, so the party that hired the expert can require a complete, signed account of them. A rule demanding a signed report from a witness no one retained would often demand something the party cannot obtain. The two required items keep the opponent from being left without notice. The subject matter tells the opponent which field the opinion comes from, which guides the choice of a rebuttal expert. The summary tells the opponent what facts the witness will rely on and what conclusions the witness will draw, which guides the preparation of a cross-examination.

The two items do separate work, and a disclosure missing either one is incomplete. A subject statement is a topic label and says nothing about what the witness will conclude. A summary without a subject leaves the field of the opinion unstated. The summary also asks less than the report does. The report needs a complete statement of all opinions with their basis and reasons and the witness’s signature, while this disclosure needs only a summary of the facts and opinions, and the rule text requires no report and no signature from the witness.

The usual errors run in two directions. One treats an expert who need not report as owing only a name or a topic, which overlooks the required summary of facts and opinions. The other demands the report’s contents from that witness, including a signed statement of basis and reasons and a list of prior testimony, which the rule does not require here. A related trap concerns the witness’s label. A physician retained only to review records and testify at trial is retained or specially employed and must provide a report, whatever the medical title. The words unless otherwise stipulated or ordered let the parties or the court change what the disclosure must contain, and the next subsection takes up when it is due.

Timing of Expert Disclosures

Rule 26(a)(2)(D) answers the question the earlier subsections left open: when the identity disclosure, the report, and the lighter summary are due. A party must make these disclosures “at the times and in the sequence that the court orders.”²² If no one has addressed the subject, the rule supplies a fallback: absent a stipulation or a court order, the disclosures must be made at least 90 days before the date set for trial or for the case to be ready for trial.²³ The two sentences create an order of authority. The court’s order controls first, a stipulation can also displace the default, and the 90-day rule applies only when neither exists. The fallback’s two reference points, a trial date and a date for the case to be ready for trial, cover calendars that fix a trial day and calendars that fix only a readiness date. The fallback clause ends with “or,” so the rule goes on to state a further alternative that this unit does not develop.

Leaving expert timing to the court lets the date fit the case. Initial disclosures run on a clock the parties themselves trigger, since they are due within fourteen days after the Rule 26(f) meet-and-confer.²⁴ Expert disclosures, which belong to the second wave, differ because the court normally specifies their timing.²⁵ An order can fix a sequence as well as dates, so it can stagger the sides and require one party to disclose before the other.

The 90-day default balances two pressures. The disclosure must come early enough for the opponent to prepare a cross-examination and arrange its own expert, the two uses the drafters had in mind, since an opinion revealed a week before trial leaves no time for either.²⁶ It must also come late enough that the expert has formed an opinion. Measuring back from the trial date, or from the date the case must be ready, ties the deadline to the case’s own calendar. The default also fits a larger sequence: expert disclosures come at least 90 days before trial, and the final pretrial disclosures follow at least 30 days before trial unless the court orders otherwise.²⁷

Questions that supply a trial date usually test the order of authority more than the arithmetic, so ask first whether anything above the default speaks to the point.

The default governs only when nothing else does. In a contract case set for trial on September 30, with no stipulation and no order touching experts, each party must disclose its testifying experts at least 90 days before that date, which falls in early July, so a disclosure served in August is late. Two other clocks must stay separate from this one: the fourteen-day period for initial disclosures runs from the Rule 26(f) conference, and the 30-day period for pretrial disclosures runs back from trial, so neither is the deadline for an expert disclosure.²⁸