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Expert fact-finding, risk assessment, and advisory services for complex and high-stakes situations

The gold standard of financial private detection

Washington’s premiere investigative firm

Legendary for its ‘opposition research’ probes — political or otherwise — that expose unseen connections

An elite international investigative agency that represents blue-chip clients

Overview

Founded in 1984 by former Senate Watergate Committee counsel Terry F. Lenzner, Investigative Group International (IGI) is a preeminent risk advisory and corporate investigations firm comprised of former prosecutors, forensic accountants, researchers, investigators, and analysts who come from the White House, federal law enforcement, intelligence agencies, the financial services industry, and journalism. Our team helps clients gather facts and intelligence, mitigate risk, and prevail in adversarial situations.

Services

History

For more than three decades, Investigative Group International (IGI) has maintained a steadfast commitment to the truth, uncovering crucial facts that have influenced high-stakes legal battles and shaped major events- while always upholding the highest ethical standards. IGI has retained its position of leadership in the industry even as the business has evolved over time, and in recent years the firm has expanded its presence and client base throughout the United States and abroad.

Since its creation, IGI has distinguished itself through its use of an expert team of analysts, investigators, accountants, and public relations specialists – supervised by experienced former prosecutors committed to strict adherence to the rules of professional conduct – to gather facts, produce sophisticated analyses, and provide technical expertise to help clients.

Leadership

Experts in complex fact-finding investigations, IGI’s team of former prosecutors, researchers, analysts, and investigators have hone their information-collection and analytical skills in a wide variety of complex legal, financial, and governance matters spanning more than 30 years.

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News

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07/24/2023

Investigative Group International (IGI) is seeking applications for a Research Associate role. Successful applicants will support and advance the firm’s investigative mission by conducting in-depth public records, online, and archival research, synthesizing and analyzing their findings, and drafting client-facing summary reports, which will help inform our clients in a variety of complex and sensitive matters.

02/02/2023

With a heavy heart, we are writing to let you know that Thomas Eugene Wendel, CEO of IGI since 2018, passed away on October 20, 2021, after a brief battle with cancer. Tom was loved dearly by his family, friends, and colleagues and will be sorely missed.

11/04/2021

IGI President Arun G. Rao has been selected by the Biden Administration to serve as Deputy Assistant Attorney General in the United States Department of Justice’s Civil Division, overseeing the Consumer Protection Branch.

04/30/2021

On October 14, 2020, IGI Executive Vice President Larry Potts, a former Deputy Director of the Federal Bureau of Investigation and a faculty member in the Criminal Justice program at Norwich University, moderated a panel discussion with other experts in the fields of law enforcement, stress management, and mental resilience.

10/28/2020

Law360 has published an analysis of the recent termination of McDonalds’ CEO Steve Easterbrook written by IGI CEO Thomas P. Wendel, IGI President Arun G. Rao, and former IGI Director Madeline C. Prebil, emphasizing the importance of properly defining and communicating the scope and results of independent investigations.

08/24/2020

IGI President Arun G. Rao was quoted in The Washington Post’s coverage of recent gun violence in the District of Columbia.

07/27/2020

The Wall Street Journal has published an obituary of Terry F. Lenzner, the founder of IGI / The Lenzner Firm, titled, “Terry Lenzner Cultivated Fearsome Reputation as Sleuth for Hire.”

05/01/2020

Terry F. Lenzner, the founder of IGI and its chief executive for more than 30 years, passed away on April 23, 2020. A legendary attorney and a pioneer in the field of private investigation, Terry maintained a fierce commitment to uncovering the truth while always upholding the highest ethical standards. Terry has bequeathed IGI with a strong legacy and sound principles that the firm will continue to build upon in the coming years.

04/29/2020

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