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Schellman is Trusted by the World's Leading Companies

Full Accreditation Stack

  • AICPA Top 50 Firm
  • CMMC C3PAO Authorized
  • FedRAMP 3PAO
  • PCI QSA
  • ISO Certification Body
  • HITRUST CSF Assessor

See all 60+ services

The Schellman Difference

The Only C3PAO With This Accreditation Stack

Most C3PAOs specialize in CMMC alone. Schellman is the only firm simultaneously holding designations as a CPA firm, PCI QSA, ISO Certification Body, HITRUST CSF Assessor, FedRAMP 3PAO, CMMC C3PAO, and APEC Accountability Agent. That breadth of expertise means we understand how your CMMC scope intersects with every other compliance program you operate. As a result, we spot conflicts and efficiencies a single-framework auditor would miss, eliminating redundancies that are costing you time and money. 

See all 60+ services

Full Accreditation Stack

  • AICPA Top 50 Firm
  • CMMC C3PAO Authorized
  • FedRAMP 3PAO
  • PCI QSA
  • ISO Certification Body
  • HITRUST CSF Assessor

See all 60+ services

marci-womack

CMMC Specialist

Marci Womack

Marci leads Schellman's CMMC practice and brings eight years of information security experience across cloud services, government, and financial services. She and her team have guided hundreds of DoD contractors through scoping, gap assessment, and certification, and have led the rollout of Schellman's CMMC services since the firm became one of the first authorized C3PAOs.

Meet Marci Contact Us

tim-walsh-profile-white

CMMC Specialist

Tim Walsh

Tim is a director with the federal practice overseeing our Schellman's CMMC engagements, bringing 10 years of information security experience across cloud services, government, and financial services. Tim previously worked for a Defense Contractor specializing in the design of physical security systems for Naval installations across the United States.  

Meet Tim Contact Us

doug-barbin-profile

CMMC Specialist

Doug Barbin

As President, Doug oversees all services provided by Schellman & Company, LLC under its alternative practice structure.  As National Managing Principal, Doug oversees all the strategy, growth, and delivery of the defense practice, including CMMC.  With close to 30 years of experience in security, compliance, and investigations, Doug provides a broad base of experience across US, government, and international compliance regulations.   

Meet Doug Contact Us

What to Expect

What to Expect From Your CMMC Specialist Conversation

This is not a sales call. It's a 30-minute working session with a senior practice leader designed to leave you with a clearer plan, whether you engage Schellman or not.

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Scope Clarity

We'll walk through your CUI and FCI footprint and help you understand which CMMC level applies, where your assessment boundary should sit, and what's in or out of scope. 

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Honest Gap Assessment

We'll discuss where your current NIST SP 800-171 posture likely stands and where the most common gaps typically emerge for organizations at the same maturity level. 

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Realistic Timeline

Based on your scope and gap profile, we'll give you a candid view of how long certification will likely take and what the critical path to a C3PAO assessment looks like. 

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Transparent Pricing

We use a fixed-fee, outcome-based pricing model and while most CMMC assessments creep, under 5% of our clients experience scope amendments. We'll explain how scoping drives cost so you can budget with confidence.

Why Choose Schellman

Why DoD Contractors Choose Schellman Over Other C3PAOs

Dozens of C3PAOs can check the CMMC box, but if your compliance footprint spans other frameworks such as PCI, ISO, HITRUST, or FedRAMP, most C3PAOs will leave you managing those programs separately, with redundant work and missed alignment opportunities. Schellman audits across every major compliance framework, with the expertise depth and infrastructure of a Top 50 CPA firm. You get one partner who sees your whole compliance picture and understands how every framework connects, saving you time and budget across your entire compliance operation.

What Matters

Schellman

Most C3PAOs

Authorized C3PAO

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Top 50 CPA Firm

✓

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Also accredited for FedRAMP, ISO, PCI, HITRUST

✓

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2,000+ audits issued annually across frameworks

✓

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Fixed-fee, scope-locked pricing

✓

Varies

Less than 5% scope creep rate

✓

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Senior practice leader on every engagement

✓

Varies

Cross-framework synergy (one audit, multiple frameworks)

✓

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  • Fixed-Fee Outcome-based pricing built on 20+ years of audit data. You know what you'll pay before we start.
  • Less Than 5% Scope Creep Fewer than 5% of our clients ever see scope amendments and when they do, it's tied to a deliberate scope expansion, not a surprise.
  • Low Overhead We're built lean, which means flexible commercial structures and pricing that doesn't carry Big Four bloat.

Learn more about our pricing process

Pricing Transparency

Transparent, Fixed-Fee Pricing.
No Surprises.

The most important factor in scoping a CMMC assessment is understanding your CUI and FCI footprint and the contract requirements driving your certification need. Once we've scoped your environment, our pricing model is built around three principles: 

Learn more about our pricing process

  • Fixed-Fee Outcome-based pricing built on 20+ years of audit data. You know what you'll pay before we start.
  • Less Than 5% Scope Creep Fewer than 5% of our clients ever see scope amendments and when they do, it's tied to a deliberate scope expansion, not a surprise.
  • Low Overhead We're built lean, which means flexible commercial structures and pricing that doesn't carry Big Four bloat.

Learn more about our pricing process

Ready to Get Started?

Get Straight Answers From an Authorized C3PAO

A 30-minute conversation with a Schellman CMMC practice leader will give you more clarity than weeks of research. No pitch. No obligation. Just answers. 

Talk With a Specialist

Disclaimer: Gartner® and Peer Insights™ are trademarks of Gartner, Inc. and/or its affiliates. All rights reserved. Gartner Peer Insights content consists of the opinions of individual end users based on their own experiences, and should not be construed as statements of fact, nor do they represent the views of Gartner or its affiliates. Gartner does not endorse any vendor, product or service depicted in this content nor makes any warranties, expressed or implied, with respect to this content, about its accuracy or completeness, including any warranties of merchantability or fitness for a particular purpose.

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© SchellmanPrivacy PolicyTerms of Use

“Schellman” is the brand name under which Schellman & Company, LLC and Schellman Compliance, LLC provide professional services. Schellman & Company, LLC and Schellman Compliance, LLC practice as an alternative practice structure in accordance with the AICPA Code of Professional Conduct and applicable law, regulations and professional standards. Schellman & Company, LLC is a licensed certified public accounting firm (Florida license number AD62941) registered with the Public Company Accounting Oversight Board (PCAOB) that provides attest services to its clients, and Schellman Compliance, LLC provides nonattest cybersecurity and compliance professional services to its clients. Schellman Compliance, LLC is not a licensed CPA firm. Schellman & Company, LLC and Schellman Compliance, LLC are independently owned and are not liable for the services provided by any other entity providing services under the Schellman brand. Our use of the terms “our firm” and “we” and “us” and terms of similar import, denote the alternative practice structure conducted by Schellman & Company, LLC and Schellman Compliance, LLC.