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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.

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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

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The Schellman Blog

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

Christian Underkoffler

Christian is a Manager on the Penetration Testing team with Schellman where he orchestrates assessments for general, PCI, FedRAMP, and other compliance frameworks. This includes project scoping, scheduling, communications, and engagement quality control from inception through the deliverable. Prior to his managment role, Christian performed a variety of offensive security assessments including internal and external network testing, social engineering, phishing, and web application assessments. He solely focused on penetration testing and red team assessments for eight (8) years, which has exposed him to a variety of environments including Fortune 500 companies, as well as an array of offensive and defensive tools.

Blog Feature

Cybersecurity Assessments | Payment Card Assessments | Compliance and Certification | Privacy Assessments | Federal Assessments | Crypto and Digital Trust | ISO Certifications | Healthcare Assessments | SOC Examinations

The Benefits of Consolidating Compliance Services with a Single Provider

By: Christian Underkoffler
April 30th, 2025

In today’s complex and constantly evolving regulatory environment, businesses face an ever-growing array of compliance requirements across multiple frameworks ranging from FedRAMP, PCI, ISO, GDPR, and HIPAA, to name a few. Navigating these compliance waters is increasingly challenging, particularly with regards to cybersecurity and data protection. However, there are measures you can take to significantly refine your compliance processes. In this article, we will explore how streamlining all of your compliance efforts with a single trusted provider can not only simplify your processes but also enhance your overall security posture.

Blog Feature

Penetration Testing | Federal Assessments

FedRAMP Red Team Assessments FAQ

By: Christian Underkoffler
September 13th, 2024

The release of FedRAMP’s Revision 5 has raised many questions, including those regarding the addition of a red team exercise requirement for those seeking FedRAMP authorization. As the #1 provider of FedRAMP assessments on the Marketplace who have extensive experience in offensive security, we have insight to offer.

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