When Stakes are High...


When Information is Elusive...


Turn to the Vander Weele Group

We Bring Clarity to Complex and Unsettling Matters

At the Vander Weele Group, it’s our business to bring clarity to complex and troubling matters. Our objective and meticulous fact-finding curtails losses from fraud, theft, waste, and inefficiencies – and, when warranted, from unfounded allegations.

We do more than find facts. We close the gaps.

Drawing on multiple disciplines, we collect ground-level information that fuels strategies to protect your organization, strengthen compliance, increase efficiency, and reduce liability. Our reporting is grounded in broad experience working on complex confidential matters.

Who We Serve

Our ideal clients are game-changers. Engaged in turnarounds or high-stakes systemic change, they are driven to understand the realities of the organizations they run or monitor – and the business relationships that support them. For our clients, embracing reality is not a mere luxury. It’s at the core of how they operate.

Let us support your mission.

What We've Done

Data Analysis

Data, ranging from accounts payable to credit card expenditures, can be used to identify suspicious patterns suggesting fictitious invoices, ghost payrollers, excessive credit card spending or improper payments.

Read More

Monitoring & Audits

Keeping an organization efficient, effective, and in compliance with government and customer mandates requires vigilance. It begins by setting and communicating standards.

Read More


Each year, U.S. organizations lose an estimated six percent* of annual revenues to fraud and occupational abuse. More often than not, it’s committed by their own employees and vendors.

Read More

Investigative Intelligence

Imagine applying best-in-class methodologies of investigative journalism to your business, government, or political challenge – but discreetly.

Read More

What's New

What Our Clients Say

  • “You and your team are one of the most thorough, professional and detailed investigative firms I have worked with in my 26 years of conducting highly sensitive corporate investigations. Your reports and attention to detail are the best I have seen. I would highly recommend you and your firm to anyone. I only wish we had discovered your company sooner.”

    John Martinicky, Global Security Chief (retired), Navistar, Inc.

  • “I have worked with Maribeth and her firm for more than six years on a wide range of sensitive investigative projects, involving complex Stateside and international subject matter. Throughout those engagements, she and the members of her team have conducted themselves in a practical, professional and discreet manner, and have consistently been an effective value-added resource for us and our clients.”

    Howard Nagelberg, Partner, Barack Ferrazzano Kirschbaum & Nagelberg, LLP

  • “I was pleased with the accuracy of the work and the prompt responsiveness that your firm applied to assist OST… I was very impressed with the technical knowledge of your staff and their ability to analyze complex relationships…”

    Bryan Marozas, Manager of Trust Beneficiary Call Center, Office of the Special Trustee (OST) for American Indians, Field Operations, U.S. Department of the Interior

  • “By documenting serious flaws in an audit, the Vander Weele Group saved our client $1.6 million. The amount of work produced in a week’s time was truly amazing. This is the best firm of this type I have ever worked with.”

    Ed Pirok, Esq., Partner, Frank & Pirok, Ltd., Chicago

  • “In Guadalajara, Jalisco, Mexico, Maribeth Vander Weele and her group conducted a very professional and high quality investigation and helped us solve a highway robbery and determine legal ways of action for the company against the people involved on it.”

    Heriberto Valle, Director, People, Process, Culture,
    Mexican Operations, Springs Window Fashions
    (In reference to Mr. Valle’s former employer, an America manufacturer located in Guadalajara.)

  • “I appreciate the work that your company has carried out with the BIE. You and your staff’s commitment to Indian Education was demonstrated on many levels. The drive to dig deeper to find the source of noncompliance was and is critical in assisting schools to improve student achievement and close the achievement gap. Your staff’s commitment to working through tough issues . . . was evident throughout the implementation of the contract.”

    Stanley Holder, retired Chief of the Division of Performance and Accountability
    Bureau of Indian Education, U.S. Department of the Interior

  • “Your passion for excellence is unequaled.”

    William G. Chadwick, Esq. President, Chadwick Associates, Inc.
    Former Pennsylvania Inspector General and Philadelphia District Attorney