Frequently Asked Questions

Commonly earlier than the disclosure date in the case requires — often before the complaint is filed or shortly after the answer. Early retention lets the expert help shape discovery: which records to demand, which treating providers or custodians to depose, which testing to request while the evidence still exists. An expert brought in after discovery closes can only work with whatever the file happens to contain. In California, the timing of the expert exchange is addressed by Code of Civil Procedure section 2034.230, which fixes the date by reference to the demand and the trial date. Nothing here calculates that date or any other; retention timing in a particular matter is counsel's decision, made against the current rules and the order in the case.

Start with the opinion you actually need, not the specialty label. A disputed fall on a jobsite may need a construction site safety expert, a structural engineer, a treating-standard opinion, or all three, and picking the wrong discipline produces a report the opposing side can attack without ever reaching the merits. Themis screens the matter first, identifies the discipline or disciplines the issue genuinely requires, and then places an expert whose credentials, publication history, and prior testimony hold up under cross-examination in that specific subject area.

For an initial screening, send the operative pleadings, a short factual summary, the key records for the disputed issue, and the trial date or current scheduling order. Complete production is not necessary to decide whether an expert can help. Identify the parties and counsel of record so a conflict check can run before substantive material is reviewed. If deadlines are close, say so in the first message — availability, not qualifications, is the most common reason an otherwise ideal expert cannot take a matter.

A conflict check runs against the parties, counsel of record, insurers, and any related entities before an expert reviews substantive material. The check covers prior retentions on either side, current engagements involving the same parties, and any personal or institutional relationship that could be developed on cross-examination. Where a network expert has previously worked for an adverse party, counsel is told immediately and a different expert is placed. Conflicts identified after retention are disclosed to retaining counsel the same day rather than left to surface at deposition.

A consulting expert advises counsel and is generally treated as work product; a testifying expert offers opinions the other side is entitled to examine. Attorneys commonly use a consultant where they want candid case assessment, help framing discovery, or a critique of an opposing expert's methodology without exposing that analysis. The distinction matters because the rules addressing discoverability treat the material a testifying expert considered differently from a consultant's work. Attorneys frequently retain in a consulting capacity first and convert the engagement to testifying later. Which capacity fits a given matter, and the discovery consequences of each in the governing forum, are decisions for counsel.

Work-product doctrine and, in federal practice, a specific rule. Federal Rule of Civil Procedure 26(b)(4)(D) addresses facts known and opinions held by a non-testifying consultant, and California, Washington, and Oregon state practice each address the treatment of non-testifying consulting experts as attorney work product. Authority also addresses how that protection changes once an expert is designated to testify. The scope of these protections differs by forum, and courts have treated draft reports and counsel communications inconsistently. This is general background, not an assurance about any particular communication — confirm the treatment in your venue before sending an expert sensitive material.

A screening call and preliminary read of the core records usually happens within a few business days of retention, and produces a candid answer on whether the record supports the opinion counsel needs. A full substantive review depends on volume: a focused chart or a single-issue technical file can be completed in a week or two, while a multi-provider medical record or a document-heavy financial matter runs longer. Expedited review is available where a disclosure deadline or motion date is close, and turnaround is confirmed in writing before the engagement begins.

Expert witness work is billed hourly in nearly every discipline, with the rate set by specialty, credentials, and the type of work. Industry practice is a base hourly rate for record review, research, and report drafting, and a higher rate for deposition and trial testimony, often subject to a half-day or full-day minimum. Physician, engineering, and valuation experts sit at the higher end of the range. Themis provides a written fee schedule covering every rate, minimum, and reimbursable expense before any engagement begins, and preliminary screening is complimentary.

Hourly is the standard structure, because the volume of material and the case's procedural path are rarely knowable at retention. Flat or capped fees are sometimes used for a discrete, well-bounded task — a records screening, a single-issue rebuttal, or a defined document review — where the scope can be fixed in advance. Testimony itself is almost never flat-rated, since deposition and trial length are controlled by opposing counsel and the court. Where a flat arrangement makes sense, it is defined in writing with an explicit scope boundary.

Four things: record volume, the number of disputed issues, whether the matter reaches deposition and trial, and how late the expert is retained. Record volume dominates — a chart spanning several providers or a financial file with years of transactions consumes review hours before any analysis begins. Rebuttal work adds cost, because critiquing an opposing report requires reviewing the material that report relied on. Late retention is expensive in its own right: compressed timelines require concentrated hours and often duplicate work that early involvement would have avoided.

California Code of Civil Procedure section 2034.430. It is the provision addressing payment of an expert's reasonable and customary hourly fee for time spent testifying at deposition, which party bears that fee, and tender of the fee at the deposition. Related provisions address the allocation of preparation time and travel, and a motion procedure where the fee is contended to be unreasonable, on evidence of the expert's ordinary rate and comparable rates in the field. This is general background. The current text of the statute, and how it applies to a particular deposition or agreement between the parties, must be confirmed by counsel.

Yes, as is standard across the field. A retainer is collected before substantive review begins and is applied against hours as they are incurred, with the balance replenished if the engagement continues past it. Trial and deposition testimony are commonly billed in advance or secured by a separate deposit, because testimony days are reserved to the exclusion of other work and are frequently continued on short notice. Unearned retainer amounts are returned when an engagement ends. Every term appears in the written engagement agreement before any work starts.

No — contingent fees for testifying experts are broadly considered improper. Tying an expert's compensation to the outcome gives the expert a financial stake in the verdict, which courts and bar authorities across jurisdictions treat as compromising the independence expert testimony depends on, and which hands opposing counsel a direct line of impeachment. Testifying experts are compensated for time, not results, regardless of how the case resolves. Payment arrangements should be documented in the engagement agreement, since expert compensation is a routine and permissible subject of cross-examination.

Three things in every forum: the witness is qualified in the relevant field, the subject is beyond common experience so the testimony will actually help the trier of fact, and the opinion rests on a reliable basis the court can trace from the underlying data to the conclusion. The third element is where opinions fail. Courts increasingly scrutinize the reasoning connecting evidence to conclusion rather than deferring to credentials, so a report must show its methodology and state candidly what the evidence will and will not support.

Sargon Enterprises v. University of Southern California (2012) is California's expert gatekeeping decision. It holds that a trial court may exclude expert opinion that is speculative, that rests on assumptions without evidentiary support, or where an analytical gap separates the data from the conclusion. Evidence Code sections 801 and 802 supply the authority to examine the matter an opinion is based on, and section 720 governs qualification. California does not apply Daubert. The practical consequence is that an unquestionably qualified expert can still be excluded if the reasoning cannot be traced.

Neither label fits cleanly. California rejected Daubert and applies Sargon gatekeeping under Evidence Code sections 801 and 802 to expert reasoning generally. Separately, novel scientific techniques are evaluated under the Kelly standard — historically called Kelly/Frye — which asks whether the method has gained general acceptance in the relevant scientific community. The two operate on different questions: Kelly addresses whether a new scientific technique is reliable enough to be presented at all, while Sargon addresses whether a particular expert's reasoning from the evidence is sound.

Washington applies the Frye general-acceptance test to novel scientific evidence, together with Evidence Rule 702. Under Frye, novel scientific theory or methodology is admissible only if it has achieved general acceptance in the relevant scientific community; the inquiry is directed at the method rather than at the individual expert's conclusions. ER 702 then requires that the witness be qualified and that the testimony assist the trier of fact. Washington has declined to adopt Daubert, so a report drafted around Daubert factors addresses a test King County and Pierce County courts do not apply.

Oregon evaluates scientific evidence under the framework its Supreme Court built in State v. Brown (1984) and State v. O'Key (1995), applied through Oregon Evidence Code Rule 702. Brown sets out factors bearing on scientific validity, and O'Key incorporated Daubert-style reliability considerations into that existing structure while keeping Oregon's own analysis. The result is a test that overlaps with federal practice without being identical to it. Multnomah, Washington, and Lane County Circuit Courts assess whether the underlying science is valid and whether its probative value survives OEC 403 balancing.

Federal courts in the Ninth Circuit — including C.D. Cal., N.D. Cal., S.D. Cal., E.D. Cal., W.D. Wash., E.D. Wash., and D. Or. — apply Federal Rule of Evidence 702 as construed in Daubert v. Merrell Dow. The court acts as gatekeeper, examining testability, peer review and publication, known or potential error rate, standards controlling the technique's operation, and general acceptance. The Ninth Circuit has emphasized that the inquiry is flexible and directed at methodology rather than conclusions, and that the factors are illustrative rather than a checklist.

The December 2023 amendment made two things explicit. First, the proponent must demonstrate to the court that it is more likely than not that each admissibility requirement is met — a preponderance standard many courts had been applying loosely. Second, the expert's opinion must reflect a reliable application of the methodology to the facts, language added because courts had been treating application questions as going to weight rather than admissibility. The amendment did not create a new test; it corrected a drift toward admitting opinions and leaving reliability entirely to cross-examination.

By writing it as if the motion has already been filed. A motion to exclude typically attacks qualification in the specific subject area, the reliability of the method, the factual support for the assumptions, or the analytical gap between data and conclusion. Reports are prepared with the governing standard named and satisfied: methodology stated, every record relied on identified, assumptions tied to evidence in the file, and the limits of the opinion acknowledged rather than papered over. Opinions the record cannot sustain are not offered in the first place.

A conflict check clears, the engagement agreement and fee schedule are executed, and the record transfers. The expert then completes a substantive review and reports back to counsel — usually by call rather than in writing at this stage — on what the record supports, what it does not, and what additional material would strengthen or undermine the opinion. Only after counsel decides to proceed does report drafting begin. That sequence keeps preliminary impressions out of a discoverable document while the theory of the case is still being formed.

A complete statement of every opinion and the basis for each, the facts and data considered, the methodology applied, any exhibits used to support the opinions, the expert's qualifications, a list of prior testimony, and compensation for the work. Federal Rule of Civil Procedure 26(a)(2)(B) is the provision addressing the content of a retained expert's report in federal practice; state practice in California, Washington, and Oregon addresses disclosure differently, and counsel must confirm what the governing rule and any order require in the matter at hand. Reports are written so a judge ruling on a motion to exclude can follow the path from record to conclusion without inference.

Preparation begins with the expert re-reading the full file and the report, then working through the anticipated lines of attack with retaining counsel: qualification challenges, assumptions the opposing side will dispute, alternative explanations for the evidence, and prior testimony or publications that could be used for impeachment. The objective is not rehearsed answers but precision about what the opinion is and where its boundaries sit. An expert who concedes clearly on the boundary questions is far more credible on the ones that decide the case.

Direct examination establishes qualification, then walks the jury through the methodology and the opinions in an order they can follow. Cross-examination targets bias, compensation, assumptions, and any gap between the record and the conclusion. Effective trial testimony translates technical material without flattening it — a jury cannot weigh what it cannot follow, but an expert who oversimplifies invites a cross that exposes the simplification. Testimony is delivered to the jury, not to counsel, and concessions are made where they are warranted rather than defended past the point of credibility.

Counsel is told during or immediately after the screening review, before a report exists and before anything has to be disclosed. That is the single most valuable moment in an expert engagement. An opinion that will not withstand deposition is worse than no opinion, because it commits the case to a theory that collapses under examination and weakens your settlement position. Where the record supports a narrower opinion than counsel hoped for, that narrower opinion is stated plainly, along with what additional evidence would be needed to go further.

From retention to a signed report is commonly four to eight weeks for a matter of ordinary complexity, driven mostly by record volume and by how quickly complete production reaches the expert. Deposition typically follows disclosure by weeks to months depending on the scheduling order. Trial testimony can be a year or more after retention in a civil matter. Expedited timelines are workable when a deadline requires it, and the realistic turnaround is confirmed in writing at retention rather than estimated optimistically and revised later.

Yes for depositions, and often for trial. Remote deposition testimony is routine in all three states and is now the default in many matters. Remote or hybrid trial testimony is available in a number of courts subject to the judge's discretion, the local rules, and any objection from the opposing party — California courts have broad authority to allow remote appearances in civil proceedings, and Washington and Oregon courts permit it under their own rules. Confirm the presiding judge's practice early, because a late request is more likely to draw an objection.

Yes. Travel is available throughout California, Washington, and Oregon for depositions, hearings, site inspections, and trial testimony, in state and federal court. Travel time and expenses are billed at the rates set out in the fee schedule and are agreed in advance. Where the medical or technical issue is significant but the case value does not support the cost of travel, remote testimony removes that expense entirely — which is frequently the deciding factor in whether a matter can support an expert at all.

Continuances are expected and planned for. Trial dates in California, Washington, and Oregon superior and circuit courts move regularly, and testimony blocks are reserved with that in mind. Counsel is asked to give notice of a continuance as soon as it issues so the reserved days can be released and rebooked. Deposits held against a continued trial date carry forward to the new date rather than being forfeited. Where a continuance pushes testimony into a genuine conflict, the scheduling problem is raised immediately rather than discovered on the eve of trial.

Yes, and it is routine. The governing evidence rules in these forums address expert qualification in terms of knowledge, skill, experience, training, and education rather than residence, and courts address separately what familiarity a clinical standard-of-care opinion requires. Whether a particular expert is qualified to testify in a particular matter is a question for the court and for retaining counsel, not one settled here. Some professional-licensure and jurisdiction-specific opinions call for state-specific credentials or knowledge of state regulation, and where a matter needs that, an expert with the correct state qualification is placed.

A retained expert is engaged by counsel to review the case and form opinions; a subpoena compels a witness to appear, and it does not create an obligation to develop new opinions or perform analysis. Treating physicians and other percipient witnesses are commonly subpoenaed to testify about what they observed and did, which is fact testimony rather than retained expert opinion. If you need an opinion on standard of care, causation, valuation, or technical failure, that requires retention — a subpoena cannot produce it.

Dr. Alvaro Alban, MD, MBA is the founder of Themis Expert Witness, LLC and a board-certified emergency medicine physician with over twenty years of expert witness experience across more than 150 supported cases. His practice began in criminal defense work and expanded into civil litigation and professional licensing matters before administrative tribunals. The combination of medical training and formal training in finance means a single reviewer can address both the clinical record and the economic dimension of a claim, which is unusual in matters where injury and damages are both contested.

Dr. Alban personally provides emergency medicine and medical causation opinions. Through the network, Themis places experts in forensic pathology, toxicology, forensic psychology, forensic accounting, business valuation, financial analysis, real estate appraisal, vocational economics, insurance practices, architecture, structural engineering, and construction site safety. Each network expert is independently credentialed in their own field. If a matter needs a discipline outside that list, tell us — sourcing an appropriate expert is part of the service, and we will say so directly if we cannot find the right person.

Both, and the balance is deliberate. Over more than twenty years the work has come from plaintiff and defense counsel in roughly comparable measure, and in criminal matters from both prosecution and defense. That balance is a credibility asset at deposition and trial. An expert whose entire engagement history sits on one side of the docket invites a bias cross-examination that has nothing to do with the merits of the opinion, and juries respond to it. Network experts are selected with the same consideration in mind.

Themis operates as a managed network rather than a solo practice or a referral directory. Dr. Alban screens the matter, identifies the discipline the issue actually requires, and either provides the opinion himself where it is medical or sources and vets an independently credentialed expert in the relevant field. He then stays involved through report review and trial preparation. Counsel deals with one point of contact rather than assembling and coordinating experts separately — and where a matter has a medical dimension alongside another discipline, both opinions are developed in parallel.

California, Washington, and Oregon — state and federal, civil and criminal. That includes Los Angeles, San Francisco, San Diego, Orange County, and Sacramento County Superior Courts; King, Pierce, Snohomish, and Spokane County Superior Courts; Multnomah, Washington, Lane, and Clackamas County Circuit Courts; and the federal districts of C.D. Cal., N.D. Cal., S.D. Cal., E.D. Cal., W.D. Wash., E.D. Wash., and D. Or., together with Ninth Circuit appellate matters. Remote review and testimony are available throughout, and travel within the three states is routine.