VERTEX has Experts that Talk the Talk and Walk the Walk.

Unlike others, VERTEX provides forensic consulting alongside traditional AEC services which allows for a 360 degree view of your project.

VERTEX Services


Need an expert for your case?

Our forensics experts work alongside AEC specialists which enhances our skills and bolsters the credibility of our expert consultants.

Find an Expert


VERTEX delivers innovative solutions on complex projects globally.

Since 1995, VERTEX has completed over 90,000 projects.

View Portfolio


VERTEX believes in a Lifetime of Learning philosophy.

Stay current with our industry experts as they share their insights and knowledge on the built environment.

View Insights

Grow Your Career

Join Our Team

VERTEX is looking for talented individuals to join a highly technical team of forensic consultants, design engineers, construction managers, and environmental scientists.

Learn More

Contact Us

Have a question or want to speak with a technical professional?

VERTEX is a multi-discipline firm with global coverage. Our international network of resources enables us to provide multi-national clients with the most qualified local professionals who understand the culture, language, and regulatory framework.

Call Us: 888.298.5162

Call Us

Call us at 888.298.5162.

Chelsea CullumCMA, CFE

Executive Vice President, Forensics

Chelsea is a forensic accounting and quantum expert with a particular focus in the government contracts and commercial sectors.

Chelsea has acted as an expert in litigation, delivered a deposition and provided expert testimony on matters before the Armed Services Board of Contract Appeals and the US Court of Federal Claims. She has assisted clients in government contracts-related litigation in federal, state, and local courts, as well as all phases of dispute resolution at arbitration boards and various Boards of Contract Appeals.

Chelsea has experience working on projects throughout Europe, the Middle East and North America. She has worked for clients in the defense, industrial, infrastructure, oil and gas, power and utilities, and technology sectors. She has specialized experience working on US government contracts.

Chelsea’s extensive experience in government contracts matters includes preparation, review, and analysis of Requests for Equitable Adjustment and claims; damages analysis resulting from defective pricing, false claims, Truth in Negotiations Act (TINA) claims and Contract Disputes Act (CDA) claims. It also includes consulting on compliance with FAR Part 31 Cost Principles for Government audits and disputes between contractors and the Government; the preparation, review, and negotiation of termination settlement proposals (TSPs); rebuttal of DCAA and other Government audit reports; and analyzing cost realism in bid protests, among other matters. Throughout these roles, Chelsea has conducted extensive reviews of accounting records, accounting systems, and various government policies and procedures, including the FAR, Contract Pricing Reference Guides, and DCAA Contract Audit Manual (DCAM).

Chelsea holds a BS Finance and International Business and is a Certified Management Accountant (CMA) and Certified Fraud Examiner (CFE). She is an associate member of the American Bar Association (ABA), a member of the National Defense Industrial Association (NDIA), a member of the Association of Certified Fraud Examiners (ACFE) and a member of the Institute of Management Accountants (IMA). She is also an adjunct professor at George Washington University where she teaches ‘Pricing and Cost Issues in Government Contracts’ in the MS Government Contracts program.

Education & Certification

B.S. Finance and International Business – University of Virginia

Certified Management Accountant (CMA)

Certified Fraud Examiner (CFE)


Adjunct Professor – The George Washington University

American Bar Association (ABA), Institute of Management Accountants (IMA)

National Defense Industrial Association (NDIA)

The Association of Certified Fraud Examiners (ACFE)

Areas of Service


Expert Witness Services

Government Contracts