Expertise
Financial Expert Witness Services
A financial expert witness puts a defensible number on the money at issue in a dispute and explains to the court how that number was derived. Themis Expert Witness places credentialed financial and economic experts with civil and criminal counsel throughout California, Washington, and Oregon. Dr. Alvaro Alban, MD, MBA, whose training combines medicine with formal finance education, screens each matter and manages the expert through report and testimony.
What does a financial expert witness do?
A financial expert witness quantifies the money in dispute. Working from accounting records, tax filings, and industry data, the expert builds a damages model — lost profits, diminished value, or unjust enrichment — states the assumptions behind it, and defends that model in a written report, at deposition, and at trial.
The number is rarely the hard part. Any competent analyst can run a discounted cash flow or compute a but-for revenue line. What separates an opinion that survives a motion to exclude from one that does not is the chain connecting the source documents to the conclusion: which records were relied on, which were rejected and why, what growth rate was assumed, what the assumption rests on, and what happens to the total if that assumption moves two points in either direction.
Financial damages work also has an unusual evidentiary posture. Unlike a clinical opinion, the underlying data is largely produced by the party that stands to benefit from it. Projections prepared for a bank, a board, or an investor before the dispute arose are worth far more than projections prepared for the litigation, and a credible expert says so plainly — including when the pre-dispute documents undercut the client's theory.
The engagement usually splits into three phases. First, a solvency-and-sufficiency review of what the records will actually support. Second, construction of the model, with sensitivity analysis showing how the result responds to each contested input. Third, rebuttal — reading the opposing expert's report closely enough to identify not just where the numbers differ but which single assumption is doing most of the work in producing the gap.
Case types we support
In civil litigation, financial testimony usually answers one of two questions: how much the plaintiff actually lost, or whether the defendant's accounting of a transaction holds together. Typical engagements include:
Civil litigation
- Lost profits and business interruption — but-for revenue modeling, fixed and variable cost separation, and mitigation analysis
- Economic damages models in breach of contract, tortious interference, and unfair competition claims
- Forensic financial analysis — reconstructing books, tracing transfers, and identifying undisclosed distributions
- Solvency and insolvency opinions in fraudulent transfer, preference, and successor liability disputes
- Class action damages models, including common-methodology support at the certification stage
- Marital dissolution finances — income available for support, separate versus community characterization, and tracing
- Shareholder, partnership, and buy-sell disputes requiring an independent read of the financial statements
- Insurance claim quantification, including proof-of-loss disputes and business income calculations
- Rebuttal and critique of an opposing damages expert's methodology and inputs
Criminal matters
- Fraud prosecutions where the alleged loss amount drives both the charge and the guidelines calculation
- Embezzlement and employee theft cases requiring reconstruction of the books from incomplete records
- Money laundering matters turning on the tracing of funds through commingled accounts
- Tax matters — unreported income methods, basis reconstruction, and civil-versus-criminal distinctions
- Healthcare billing fraud, where coding and medical necessity questions sit alongside the financial analysis
- Asset forfeiture proceedings requiring a traceability analysis of the property the government seeks
- Sentencing-stage loss and restitution disputes where the calculation method is contested
In criminal matters, financial testimony often decides whether the government's loss figure is supportable and whether the transactions at issue carry the intent the indictment assigns them. Engagements include:
How financial expert testimony changes case outcomes
Damages testimony decides the size of the case, and the size of the case decides whether it settles. A liability theory can be strong and still produce a nuisance-value resolution if the damages model is speculative enough that opposing counsel discounts it heavily. Conversely, a well-documented lost profits calculation grounded in pre-dispute financial statements moves a reserve figure before anyone files a dispositive motion.
Exclusion risk is concentrated in this discipline more than most. Courts routinely admit the expert and then strike the opinion, because the analyst was plainly qualified but the model rested on a projection with no historical support or a growth assumption nobody could source. When damages testimony is excluded late, there is usually no time to cure it, and the claim survives in name only.
Rebuttal work is undervalued. Most damages reports contain one or two load-bearing assumptions, and the rest of the arithmetic follows from them. An expert who identifies that assumption and shows the court what the total becomes when it is corrected does more useful work than one who produces a competing model of equal complexity and invites the jury to pick.
Why West Coast attorneys retain Themis for financial matters
Themis Expert Witness operates as a managed network. The testifying financial experts on these matters are independently credentialed accountants, economists, and valuation professionals sourced and vetted for the specific issue in dispute. Dr. Alban's own training combines medicine with formal finance education, and that background is the reason the initial screening call is substantive rather than clerical — the questions about what the records will support and where the model is exposed are asked before an expert is placed, not after a report has been served.
That dual background also matters directly in a narrow but common category of matters: healthcare billing fraud, medical necessity disputes, and damages claims where the underlying loss is a medical one. In those cases the financial expert and the medical review can proceed in parallel rather than sequentially, and the two opinions can be checked against each other before either is filed.
The governing admissibility standard shapes the report from the outset. California trial courts apply the gatekeeping analysis from Sargon Enterprises v. University of Southern California together with Evidence Code sections 801 and 802, which authorize the court to examine the matter an opinion rests on — the provision under which speculative damages projections are most often struck. Washington applies Frye general acceptance to novel scientific method alongside ER 702; Oregon uses the State v. Brown and State v. O'Key framework under OEC 702. Federal matters in the Ninth Circuit are governed by Rule 702 as amended in December 2023, which requires the proponent to establish admissibility by a preponderance and closed the practice of treating methodological defects as going only to weight.
Engagements are staffed with a stated scope, a written fee schedule, and a candid assessment of what the available records will and will not support. Testimony is available in state and federal courts across California, Washington, and Oregon, in person or by remote deposition.
Practice notes for each jurisdiction are set out on the California, Washington, and Oregon pages, and the engagement process explains what happens after you make contact.
Frequently Asked Questions
Financial expert witness work is billed hourly, and the total depends far more on data volume than on the size of the claim. A lost profits analysis built from clean audited statements is a fraction of the cost of one requiring reconstruction from bank records and handwritten ledgers. Deposition and trial testimony are typically billed at a higher rate or against a half-day or full-day minimum. Preliminary screening with Themis is complimentary, and a written fee schedule and estimated scope are provided before any expert is placed on the matter.
For a straightforward lost profits or business interruption calculation with organized records, a draft report in four to six weeks is realistic. Forensic reconstruction from incomplete books, tracing through commingled accounts, or a class-wide damages model takes considerably longer. The binding constraint is almost always document production rather than analysis time, which is why early retention matters: an expert brought in during discovery can tell you which financial records to demand while there is still time to demand them.
No. Dr. Alban personally handles emergency medicine and medical causation matters. Financial testimony is provided by independently credentialed experts in our network — forensic accountants, economists, and valuation professionals selected for the specific issue in dispute. His role on a financial matter is screening, vetting the expert against the facts of your case, and staying involved through report review and trial preparation. Where the matter also has a medical dimension, he may provide a parallel opinion in his own specialty.
Under Evidence Code sections 801 and 802 as applied in Sargon, the court examines the matter the opinion is based on and may exclude testimony that is speculative or that rests on reasoning the expert cannot trace from the data to the conclusion. In practice, damages opinions are most often excluded not for a defect in the expert's credentials but because a revenue projection or growth assumption had no support in pre-dispute records. Qualification under section 720 is rarely the contested issue.
For most commercial damages matters: three to five years of financial statements before and after the alleged conduct, federal and state tax returns, general ledger detail, bank and merchant statements, any budgets or projections prepared before the dispute arose, and relevant contracts. Pre-dispute projections carry disproportionate weight, so they are worth locating early. Incomplete records do not prevent an initial screening call — identifying what is missing and what it would prove is often the most useful early product of the review.
Yes, and in some matters that is the right sequence. A consulting expert can evaluate the strength of a damages theory, stress-test an opposing expert's model, or assess exposure before anyone commits to a number in a disclosure. Work performed in a purely consulting capacity is generally protected from discovery, subject to the rules of the governing jurisdiction. If the analysis supports a testifying opinion, the engagement can be converted, though counsel should weigh the discovery consequences of that conversion first.
Related expertise
Forensic Accountant Expert Witness
Fraud investigation, asset tracing, embezzlement analysis, and financial reconstruction for civil and criminal cases.
Business Valuation Expert Witness
Fair market value opinions for shareholder disputes, marital dissolution, and buy-sell litigation.
Insurance Expert Witness
Coverage disputes, bad faith claims, industry custom and practice, and claims-handling standards.
Complimentary preliminary screening
Retain a financial expert witness
Preliminary screening is complimentary. Send the posture of your matter — jurisdiction, claims, and the schedule you are working under — and Dr. Alvaro Alban, MD, MBA will identify the expert discipline the issue points to, check availability and conflicts, and tell you candidly whether the materials look suitable for expert review before you retain anyone.
- Service area
- California, Washington, and Oregon — state and federal courts, in person and by remote deposition.
- Phone
- (347) 860-4763