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Credentials and classifications
The credentials behind every engagement.
Two credentials, one for each half of the obligation. ADA Coordinator Certification governs the program: designation, self-evaluation, transition planning and grievance process. The Department of Homeland Security Trusted Tester process governs the technical standard. One firm delivers both, so a public entity does not run two procurements to meet one obligation.
Identifiers you can look up
Every credential below carries an identifier your procurement office or general counsel can verify in the issuing registry.
- ADA Coordinator Cert. (ADACC)55147918-4622
- Department of Homeland Security Trusted TesterTT-2604-08987
- NYC Minority Business EnterpriseMWCERT2025-1083
- Federal UEI, SAM.govE2Q7D9LYPM54
- NYC Vendor, PASSPortVS00099772
- NAICS541519 · 541611
Certifications and registrations
- ADA Coordinator Certification (ADACC)The program credential. Earned through the ADA Coordinator Training Certification Program (ACTCP), University of Missouri, College of Arts and Sciences, School of Architectural Studies, with the Great Plains ADA Center. Approved designation ADAC. Maintained through the program's annual renewal cycle55147918-4622
- Department of Homeland Security Trusted TesterThe technical credential. U.S. Department of Homeland Security, Office of Accessible Systems and Technology. The federal manual testing process for Section 508 conformanceTT-2604-08987
- NYC Minority Business EnterpriseNYC Department of Small Business Services. Status confirmable in the NYC Online Directory of Certified BusinessesMWCERT2025-1083
- Federal entity registrationSAM.gov Unique Entity IdentifierE2Q7D9LYPM54
- New York City vendorNYC PASSPortVS00099772
- Legal entityGuillaume & Co. LLC, New York domestic LLCDOS ID 7265133
- Industry classificationNAICS codes carried on the federal registration, listed in order of fit to the work performed541519 · 541611 · 541511 · 541512 · 541990
- Federal size statusSmall Business and Small Disadvantaged BusinessSelf-certified
Trusted Tester is the manual testing process federal agencies use to validate Section 508 conformance. Certifications are held by the practitioner and are not an endorsement of this firm by the University of Missouri, the Great Plains ADA Center, or any federal agency.
Who signs the work
Accessibility certifications are held by people, not by companies. Work is performed and signed by certified personnel of the practice, and testing is never subcontracted to a scanning vendor.
Marc Guillaume
Principal
Department of Homeland Security Trusted Tester, certificate TT-2604-08987. ADA Coordinator Certification, ADACC 55147918-4622. Both verifiable by identifier in the issuing registry.
References and work samples available on request under appropriate confidentiality terms.
What this means for buyers
The classifications below affect how your procurement office can contract with the practice.
Listed in the public directory
Listed in the NYC Online Directory of Certified Businesses, so a procurement officer can confirm status independently.
Independently verifiable
Prime contractor participation goals
Engagement supports a prime contractor's M/WBE participation goals on City and State work.
Subcontract ready
Federal registration active
Registered in SAM.gov with an active Unique Entity Identifier, and self-certified as a Small Disadvantaged Business.
SAM.gov active
Put these credentials to work
Whether you are a procurement officer vetting a vendor or an organization that needs a credentialed audit, a short call clarifies fit and scope.
Book a 30-minute call