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


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.

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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.


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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