Objective scientific and strategic advisory grounded in evidentiary discipline, regulatory understanding, and real-world complexity.

SCIENCE. STRATEGY. INFLUENCE. 

Scientific Analysis Built to Withstand Scrutiny

SCIENTIFIC LEADERSHIP

Andrea E. Holmes, PhD

Scientific Expert Witness • Analytical Chemist • Professor

Andrea E. Holmes, PhD, scientific expert witness, professor of chemistry, author, and founder of Holmes Research Group.

Dr. Andrea E. Holmes is an analytical chemist, professor, author, and scientific expert witness with expertise in analytical chemistry, laboratory science, scientific evidence evaluation, regulatory interpretation, controlled substances, cannabis science, and complex technical investigations.

She works with attorneys, businesses, regulators, and organizations requiring objective scientific analysis, technical review, expert testimony, and strategic guidance in matters involving scientific evidence, testing methodologies, product evaluation, regulatory compliance, and emerging technologies.

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OUR PRINCIPLES

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Objective

Independent

Rigorous

Trusted

Objective analysis. No agenda. No conflicts.
Evidence-based. Methodical. Defensible.
Decades of combined experience in high-stakes matters.
Relied upon by attorneys, regulators, companies and policymakers.



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TRUSTED WHERE ACCURACY MATTERS

HRG supports attorneys, regulators, executives, trade organizations, and policymakers confronting complex scientific, regulatory, and strategic questions.

Our work spans litigation, regulatory proceedings, legislative initiatives, and emerging industries where technical accuracy, evidentiary rigor, and informed judgment are essential.

We combine scientific expertise with strategic insight to deliver objective analysis, defensible conclusions, and clear communication when the stakes are high.

EXPERTISE

Integrated counsel at the intersection of science, law, and policy.

INSIGHTS

Analysis that informs what comes next.

REPRESENTATIVE ENGAGEMENTS

Litigation

Regulatory Proceedings

Legislative Initiatives

Product Evaluation

Scientific Due Diligence

Emerging Industries

Science. Strategy. Influence.