"The comprehensive IRS approach lays the foundation for integrity, trust, continuity, and security."

Our services

Forensic Investigations

The top specialists at IRS have over 30 years of national and international experience in conducting independent investigations.

Our services include fraud prevention, background checks, due diligence, and internal investigations.

We work discreetly and professionally to protect your business interests. The comprehensive IRS approach lays the foundation for integrity, trust, continuity, and security. Proportionality and subsidiarity are guiding principles in this approach.

Forensic IT Services

The scope and complexity of digital information are increasing rapidly, as is the need for more expertise.

With their extensive and unique experience in the field of forensic IT, IRS specialists can assist you with issues in all areas of their expertise. Where traditional investigations fall short, IRS is able to make the deleted visible again, secure it, search it, and analyze it.

eDiscovery

In today's digital world, access to and analysis of digital data are crucial. We use advanced eDiscovery tools such as NUIX, which contain artificial intelligence approved by the European Commission.

This enables us to work efficiently and cost-effectively, identifying and analyzing relevant data quickly and accurately.

International Investigation

With extensive experience in international affairs, we are able to effectively address cross-border investigations.

Our expertise includes antitrust cases, money laundering practices, mergers and acquisitions. We understand the complexity of international laws and regulations and provide solutions that meet the highest standards.

Why choose IRS?

You can trust that our findings are honest and unbiased.

Our senior researchers have extensive experience and in-depth knowledge in their field.

By using NUIX and artificial intelligence, we work efficiently and cost-effectively, without compromising on quality.

We have a proven track record in handling complex international cases, making us a reliable partner for cross-border investigations.

This is how we deliver on our promises

At IRS, we understand that each investigation is unique. Therefore, we offer customized solutions tailored to the needs of our clients.

Our approach is characterized by

Who Are We?

IRS is a leading investigative firm distinguished by independence and expertise. Our expertise and years of experience make us a reliable partner for complex investigations. We are committed to professional and personal integrity and strictly adhere to applicable professional rules. With our advanced eDiscovery tools and a team of senior researchers, we offer efficient and cost-effective solutions to various legal and business challenges.

Our team

Managing Partner

"THE COMPREHENSIVE IRS APPROACH LAYS THE FOUNDATION FOR INTEGRITY, TRUST, CONTINUITY, AND SECURITY."

Aart has over 30 years of experience in conducting fraud and fact investigations. Before becoming Managing Partner at IRS, he led the investigation division of one of the Big Four firms and worked on extensive and high-profile cases, including the investigation into the dormant accounts of Holocaust victims in Swiss banks. Aart has extensive experience in complex international fraud investigations, tracing assets in various jurisdictions, and conducting large-scale investigative due diligence. Additionally, Aart has conducted numerous fact investigations for both governments and international companies.

Forensic Accountant

"NUMBERS DON'T TELL EVERYTHING. IT'S ABOUT THE TRUTH BEHIND THE NUMBERS."

Marcelline has been active for over 20 years as both a certified public accountant and a forensic accountant. Her extensive experience with various large international and local companies gives her excellent insight into potential fraud problems and risks within those companies. Her skill lies not only in quickly identifying issues within records but also in recognizing where information is missing and thereby uncovering concealed fraud. In addition to her work as a certified public accountant and forensic accountant, Marcelline is active as a quality assessor for the professional organizations NBA and SRA.

Forensic IT Specialist

"DIGITAL INFORMATION IS FOUND EVERYWHERE. IRS MAKES THE DELETED VISIBLE AGAIN, SECURES IT, SEARCHES IT, AND ANALYZES IT."

Hans Reijner has over 30 years of experience in forensic IT investigations and is an expert in Data Security. Before joining IRS, Hans worked as Head of IT Security and Senior Security Consultant at various international organizations. Hans has extensive experience with forensic IT investigations in cases of fraud, integrity issues, and antitrust matters, both nationally and internationally.

Senior Forensic Investigator

"INCIDENTS IN THE AREAS OF INTEGRITY AND SECURITY ARE VERY IMPACTFUL FOR ORGANIZATIONS AND THE PEOPLE ASSOCIATED WITH THEM. IN THESE SITUATIONS, FACTS FORM THE MOST STABLE BASIS FOR DECISION-MAKING."

Henno de Kruijk has extensive experience in conducting forensic and forensic IT investigations. Before joining IRS, Henno worked in Russia as a Security Coordinator at the Anglo-American School, advised on Security Risk Management for international companies, NGOs, and governments, and worked for the Defense Ministry. Henno has extensive experience in conducting investigations related to fraud, integrity, and security-related matters.