Our History & Founder

Our History

Founded by former Senate Watergate Committee counsel Terry F. Lenzner in 1984, IGI is a preeminent risk advisory and corporate investigations firm with core specialties in internal investigations, regulatory and competitive intelligence, due diligence, executive background investigations, and litigation support. By combining seasoned attorneys with sophisticated analysts, investigators, accountants, and public relations specialists, we provide our clients with unparalleled strategic counsel and technical expertise. Whether for a Fortune 500 company, Ivy League university, investment firm, or a prominent political figure or entertainer, we help clients solve complex problems, mitigate risk, navigate a developing crisis, and prevail in adversarial situations.

IGI’s founder and chairman emeritus is Terry F. Lenzner, who served as Assistant Chief Counsel to the Senate Watergate Committee. Prior to establishing IGI, Lenzner also served as a trial attorney with the Department of Justice’s Civil Rights Division, as a federal prosecutor in the U.S. Attorney’s Office for the Southern District of New York, and in private practice.


Tom Wendel, IGI’s president, has extensive financial and forensic accounting experience gained from his time as a partner at a major accounting firm and as a financial manager.

Jonathan Lenzner, IGI’s CEO, previously served as a federal prosecutor in the U.S. Attorney’s Office for the District of Maryland and in the New York County (Manhattan) District Attorney’s Office, and also brings expertise in strategic and crisis communications.

IGI’s investigators and researchers have backgrounds in such fields as law, investigative journalism, law enforcement, accounting and finance, intelligence, corporate security, Cabinet-level vetting, computer forensics and risk management. Included among them are former senior investigators in government agencies, including the Federal Bureau of Investigation, the Internal Revenue Service, the Department of Justice, and The White House.

We are expert fact-finders. Our core competencies include compiling and analyzing large volumes of data, identifying and interviewing individuals with knowledge of the pertinent facts, and efficiently obtaining open source and public record information throughout the world. What sets us apart is our ability to match our investigative work to our clients’ concerns and objectives. We identify and frame issues, plan our investigation, gather and analyze evidence and report investigative results, all in the context of what our client wants to accomplish. Our legal, financial and business experience overlays our investigative experience and fact-finding skills to produce relevant, useful, cost-effective results.

We pride ourselves in understanding our clients’ objectives, pursuing those objectives with unwavering loyalty and determination, and following a logical investigative plan that focuses on areas most likely to provide useful results.