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Schellman began as a SOC audit firm 20+ years ago. While we still issue more than 2,000 SOC reports each year, our clients’ trust has propelled our expansion. Today, we offer nearly 60 types of audits and assessments delivered by full-time employees. No outsourcing. No compromises.

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Schellman is the only Top 50 CPA firm focused exclusively on IT Compliance and Cybersecurity, and we’re the #1 service provider for FedRAMP Assessments.Our industry-leading NPS scores, client retention, and employee retention (low-to-no team churn = less audit fatigue) mean our clients experience greater continuity and quality.We also understand how distracting unplanned work can be, so we focus on client-centric KPIs to help keep your business moving uninterrupted.

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SOC & Attestations

SOC & Attestations

SOC 1 / SSAE 18 Examination

SOC 2 Examination

SOC 3 Examination

SOC for Supply Chain

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C5 Attestation

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Payment Card Assessments

Payment Card Assessments

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Federal Assessments

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Healthcare Assessments

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Penetration Testing

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Cybersecurity Assessments

Cybersecurity Assessments

Cloud Configuration Assessments

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NIST Cybersecurity Framework Assessments

Schellman Software Security Assessment (S³A)

TISAX®

SWIFT Customer Security Programme

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Crypto and Digital Trust

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Schellman Training

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Corporate Social Responsibility

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The Schellman Blog

Stay up to date with the latest compliance news from the Schellman blog.

Joseph Choi

Joseph Choi is a Senior Penetration Tester with Schellman. Based in St. Louis, MO, he has six years of experience within the information security field. Prior to joining Schellman, Joseph worked as a Penetration Tester for an auditing firm and performed various types of penetration tests for financial institutions. He is now primarily focused on performing internal network and web application security assessments.

Blog Feature

Cybersecurity Assessments

Red Team Ops II: A Course and Exam Review

By: Joseph Choi
August 1st, 2023

For anyone who wants to expand their skills on red teaming with advanced OPSEC tactics and defense bypass techniques, Red Team Ops II (RTO II) is a great course among the many different exams and certifications a cybersecurity professional might invest in to advance their knowledge—and their careers.

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