By Michael Barr
Note: This article offers practical guidance for attorneys engaging technical experts. It is general commentary, not legal advice. Consult counsel about any specific matter.
A pharmaceutical expert witness has to be right about chemistry and precise about a regulatory record at the same time. Barr Group connects those experts to attorneys at no cost, with an hourly fee if retained. We are engineers by background, which is exactly why we vet outside our own field carefully rather than by reputation, and the criteria below are the ones we apply.
Their specialty matches the molecule and the question
Pharmaceutical is not a discipline. Medicinal chemistry, formulation, clinical pharmacology, regulatory affairs, and manufacturing chemistry are separate careers, and a case usually needs one of them precisely. A synthesis question needs a synthetic chemist. A bioequivalence question needs a clinical pharmacologist. A stability or impurity question needs formulation and manufacturing expertise.
The failure mode is a distinguished scientist whose specialty is one step away from the question, which opposing counsel will surface in the first hour of deposition.
They know unpredictability is an argument, not an excuse
In many technical fields a person of skill can reason reliably from a design to its behavior. In chemistry and biology, far less so, and that gap is doctrinally load-bearing. Whether a result was predictable from the prior art shapes obviousness, and whether a disclosure enabled the claimed scope shapes enablement.
An expert who treats predictability as a rhetorical flourish rather than as a technical question with evidence behind it will lose the argument to one who does not.
They can work from the regulatory record as evidence
The submission file is testimony the party gave a regulator before the litigation existed. What was claimed, what data supported it, what was amended, and what a reviewer questioned are all evidence, and they frequently contradict the position a party takes in court.
An expert who treats the file as background rather than as a source of admissions leaves the most useful material on the table.
They separate the compound from the formulation from the process
Claims read at different levels: the active molecule, a salt or polymorph, the finished formulation, the process by which it is made, and the method of using it. These are distinct inventions with distinct proofs, and the accused product may practise one and not another.
This is the same layer discipline that decides electronics and semiconductor cases, and it is missed for the same reason: the expert analyzes the level they know best rather than the level the claim reaches.
Their publication record is a cross-examination surface
Academic distinction is common in this field, and it cuts both ways. Everything the witness has published about a mechanism, a class of compounds, or a method is available to the other side, and an expert whose report sits awkwardly against their own prior work will spend the deposition explaining the difference.
Ask a candidate what they have written that opposing counsel will most enjoy finding.
They can teach chemistry to a jury without condescending
Juries in these cases are asked to hold concepts they have never encountered and to weigh competing expert accounts of them. The witness who can build the model plainly, without either jargon or a tone that talks down, wins that exchange. It is a skill, it is visible in a conversation, and no credential predicts it.
They will concede the parts that are conceded
Pharmaceutical cases are usually narrow. Much is agreed and a little is contested. An expert who contests everything spends credibility they need for the point that matters, and juries and judges both notice.
Expert profiles in this field
Anonymized profiles of pharmaceutical and life sciences experts. Names follow a conflicts check.
- ANDA and medicinal chemistry
- Medicinal chemistry and drug discovery
- Clinical pharmacology and drug development
- Pharmaceutical CMC and regulatory affairs
- Oncology biologics and monoclonal antibodies
- Cancer and antiviral drug discovery
- Pharmacy compounding and formulation
- Nanoparticle engineering and drug delivery
How we help
Barr Group is a broker rather than a roster, and our vetting is done by people who ask a candidate to explain their own work before we recommend them. That process is field-agnostic even where our own depth is not, and it is described in our guide to how expert witness firms vet experts.
Our pharmaceutical and life sciences expert witnesses cover chemistry, formulation, clinical, and regulatory questions, and we will tell you when a matter needs two of them rather than one stretched across both.
The search is free and confidential for the attorney. Our fee is built into the expert's rate, so we are paid only if you retain. Tell us about your case.