ISO 27001
Best ISO 27001 Consultants in the USA (2026): 6 Firms Compared
How we compared these firms
We looked at what each firm publicly says about:
- The ISO 27001 services it offers (readiness, implementation, audit support or assessment)
- Who issues the final certificate or report
- The other frameworks it supports
- Where it is based and who it serves
- Anything distinctive it publishes, such as pricing, accreditations or specialisms
We don't rank the firms by score. The right choice depends on your scope, industry, budget and what your customers ask for.
Comparison table
| Firm | Base | ISO 27001 services | Who certifies | Other frameworks | Notable |
|---|---|---|---|---|---|
| CyberWave GRC (publisher) | USA and India | Gap assessment, risk assessment and SoA, policies, implementation, internal audit, certification audit support | Accredited certification body | SOC 2, HIPAA, HITRUST, ISO 27701, ISO 42001 | Maps SOC 2 controls to all 93 Annex A controls; fixed-fee quotes |
| risk3sixty | Roswell, Georgia | Implementation, risk assessment, internal audit, penetration testing, fully guided programmes | External certification audit (separate) | SOC 1/2/3, ISO 42001, ISO 27701, PCI DSS, HITRUST, FedRAMP | Firm states 2,000+ engagements and a 100% certification success rate for its consulting clients |
| Withum | Princeton, New Jersey (corporate headquarters) | Full implementation or support, 2013 to 2022 upgrades, internal audit, Virtual ISMS Manager | ISO certification bodies | SOC, HIPAA, PCI, HITRUST | Independent member of HLB; consultants include lead auditors |
| Fractional CISO | USA (U.S.-based team) | Gap assessment, ISMS build, audit preparation and management, ongoing support | Client-selected auditor | SOC 2, ISO 42001, HIPAA, CMMC | Two-person teams (vCISO plus analyst); quotes 12 to 18 months |
| Rhymetec | USA (founded in New York) | ISO 27001 consulting and ISO internal audits | Not stated as certifier | SOC 2, ISO 42001, PCI DSS, FedRAMP | Firm states 1,200+ companies trust it |
| Accorian | New Jersey, with offices in India, the UAE and Canada | ISO 27001 readiness and audit services | Check engagement terms with the firm | SOC 2, HITRUST, CREST-accredited penetration testing | Holds ISO 27001 and SOC 2 Type 2 itself |
The firms in detail
CyberWave GRC
- Operates in the USA through ICyberWave Consulting Services LLC (Sheridan, Wyoming) and in India through ICyberWave Consulting Services (OPC) Private Limited.
- End-to-end ISO 27001: scoping, gap assessment, risk assessment and Statement of Applicability, policies, implementation support, internal audit and certification audit support. Certificates are issued by accredited certification bodies; we don't certify our own work.
- We build common control frameworks: SOC 2 controls mapped to all 93 ISO 27001:2022 Annex A controls, so companies with SOC 2 move straight into ISO 27001.
- Recent example: ISO 27001 in 4 weeks for a healthcare client.
- Best for: U.S. SaaS and healthcare companies that have SOC 2 and now need ISO 27001 for international customers, or want both at once.
risk3sixty
- Based in Roswell, Georgia.
- ISO 27001 implementation, risk assessment, internal audit and penetration testing, with a GRC platform included.
- Firm states 2,000+ engagements and a 100% ISO 27001 certification success rate for clients using its consulting services.
- Best for: companies that want a large advisory firm with its own GRC platform.
Withum
- Corporate headquarters in Princeton, New Jersey; an independent member of HLB.
- Leads full ISO 27001 implementations or supports in-house teams, including 2013 to 2022 upgrades, internal audits and a Virtual ISMS Manager service.
- Consultants include certified lead auditors.
- Best for: companies that want an accounting and advisory firm with SOC experience.
Fractional CISO
- U.S.-based team delivering ISO 27001 with a vCISO and analyst.
- Quotes 12 to 18 months from start to certification and supports clients through the audit.
- Best for: companies building a security programme from scratch alongside ISO 27001.
Rhymetec
- Founded in New York in 2015 (per a third-party directory).
- ISO 27001 consulting and ISO internal audits, plus penetration testing and vCISO services.
- Best for: companies that want internal audit and testing from one provider.
Accorian
- Based in New Jersey, with regional offices in India, the UAE and Canada.
- ISO 27001 readiness and audit services, and holds ISO 27001 and SOC 2 Type 2 itself.
- Best for: companies wanting ISO 27001 with CREST-accredited penetration testing.
Where CyberWave GRC fits
We're a good fit if you already have SOC 2, or need it too. We map your SOC 2 controls to all 93 Annex A controls, so ISO 27001 builds on what you have instead of starting again. One team runs gap assessment through the certification audit, at a fixed fee. If you need a large on-site team in your U.S. office every week, a bigger local firm may suit you better.
How to choose
- Which accredited certification body will audit you, and is it independent of the consultant?
- Can the firm reuse your SOC 2 or other existing controls?
- What timeline does it commit to, and what does it need from your team?
- Does it handle the risk assessment and Statement of Applicability, or just templates?
- Is internal audit included before the certification audit?
- What support is included for the yearly surveillance audits?
- Is the fee fixed, and is the certification body's fee included?
Frequently asked questions
An accredited certification body. In the USA, look for a body accredited by an IAF member such as ANAB. Consultants should never certify their own work.
It depends on your starting point. Firms in this guide quote anything from a few months to 12 to 18 months. Companies with SOC 2 in place usually move much faster. See ISO 27001 in 4 weeks.
U.S. customers usually ask for SOC 2; international customers often prefer ISO 27001. Many companies do both on one control set. See SOC 2 vs ISO 27001.
93 controls, in four themes: organisational (37), people (8), physical (14) and technological (34). See our ISO 27001 audit checklist.
The certificate lasts three years, with surveillance audits each year and a recertification audit in year three.