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Investigative Group International
What Does Investigative Group International Do?
Investigative Group International (IGI), founded by the late Terry F. Lenzner, was a prominent American corporate investigations and risk management firm. It gained renown for its work on high-profile cases, providing services such as due diligence, litigation support, fraud detection, and competitive intelligence to corporations, law firms, and governmental entities. While the original IGI as founded by Lenzner may have evolved or its operations been absorbed into other entities, its legacy in the private investigation sector remains significant.
Where Is Investigative Group International's Headquarters?
HQ Function
Historically served as the central hub for global operations, case management, client liaison, and strategic decision-making for complex investigations.
Notable Features:
Proximity to federal agencies, major law firms, and international organizations, facilitating its investigative work.
Work Culture:
Characterized by a demand for discretion, analytical rigor, ethical conduct, and the ability to handle highly sensitive and confidential information under pressure.
HQ Significance:
The D.C. location underscored IGI's involvement in politically sensitive cases and its expertise in navigating complex regulatory and legal environments.
Values Reflected in HQ: The firm's operations emphasized integrity, thoroughness, discretion, and delivering actionable intelligence to its clients.
Location:
Historically, IGI maintained a global reach through its strategically located offices (e.g., Washington D.C., New York, London) and an extensive network of trusted associates and contacts in numerous countries. This allowed the firm to conduct complex cross-border investigations, gather intelligence worldwide, and provide localized support for international clients.
Street Address:
700 12th St NW, Suite 700 (Historical Address)
City:
Washington
State/Province:
D.C.
Country:
USA
Where Else Does Investigative Group International Operate Around the World?
New York, NY/USA
Address: Address not publicly available (Historical Office)
Serviced clients in the financial services, legal, and corporate sectors in the U.S. Northeast and supported international cases.
London, UK
Address: Address not publicly available (Historical Office)
Facilitated IGI's investigative reach into Europe, the Middle East, and Africa.
Los Angeles, CA/USA
Address: Address not publicly available (Historical Office)
Catered to a diverse client base on the U.S. West Coast, including technology and entertainment sectors.
Buying Intent Signals for Investigative Group International
Highperformr Signals uncover buying intent and give you clear insights to target the right accounts at the right time — helping your sales, marketing, and GTM teams close more deals, faster.
Who's Leading Investigative Group International? Meet the Executive Team
As of April 2025, Investigative Group International' leadership includes:
Who's Investing in Investigative Group International?
Investigative Group International has been backed by several prominent investors over the years, including:
What Leadership Changes Has Investigative Group International Seen Recently?
No specific executive news for 'Investigative Group International' as an active, independent entity in the last 12 months has been identified. The firm's founder, Terry Lenzner, passed away in 2020. Any recent changes would likely be within entities that may have absorbed IGI's legacy operations or personnel.
What Technology (Tech Stack) Is Used byInvestigative Group International?
Discover the tools Investigative Group International uses. Highperformr reveals the technologies powering your target accounts — helping your sales, marketing, and GTM teams prioritize smarter and close faster.
Investigative Group International Email Formats and Examples
Based on common corporate structures and the historical domain (igint.com), email formats likely followed patterns such as [first_initial][last] or [first].[last].
flast@igint.com (e.g., tlenzner@igint.com) or first.last@igint.com (e.g., terry.lenzner@igint.com)
Format
tlenzner@igint.com
Example
45%
Success rate
What's the Latest News About Investigative Group International?
The New York Times • April 24, 2020
Investigative Group International Founder Terry Lenzner Dies at 80
Terry F. Lenzner, the founder of Investigative Group International (IGI) and a prominent private investigator known for his work on high-profile cases including Watergate and corporate scandals, passed away at the age of 80. His firm was renowned for its discreet and thorough investigations....more
NPR • October 26, 2010
Investigative Group International: 'The Investigator': A Private Eye's Secret Files
Terry Lenzner, founder of IGI, discussed his memoir 'The Investigator,' offering insights into the world of private investigations and some of the notable cases his firm handled, ranging from political opposition research to corporate espionage....more
Various Business & Legal Publications • Circa 1990s-2000s (General Reference)
Investigative Group International's Role in Major Corporate Litigations and Due Diligence
Throughout the 1990s and 2000s, IGI was frequently mentioned in connection with significant corporate legal battles, due diligence for mergers and acquisitions, and investigations into fraud and misconduct, establishing its reputation as a leading firm in the field....more
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