Truth. Facts. Answers.
New York's Premier Boutique Private Investigations Firm
DIESEL INVESTIGATIONS provides litigation support, witness interviews, and due diligence investigations for attorneys, businesses, and private clients. Call us when the stakes are high and you need clear, reliable answers.
Truth. Facts. Answers.
Led by a former FBI Supervisory Special Agent, we deliver verified facts, structured analysis, and court-ready results—so you can make informed decisions, strengthen your case, or act with confidence.
Whether you are preparing for litigation, evaluating risk, or seeking critical information, our work is focused, discreet, and built on federal-level investigative standards.
Explore our services below or contact us to discuss your matter.
Matt has a rare ability to balance investigative rigor with sound judgement and discretion. He is thorough, detail-oriented, and relentless in pursuing facts that matter.
Mario R, FBI Direct Report
Matthew Bertron, Founder
Matthew Bertron, a life-long New Yorker, is a retired FBI Supervisory Special Agent with 27 years of federal investigative experience. He has led and conducted complex investigations involving criminal activity, national security, counterterrorism, and counterintelligence, both domestically and internationally. Today, he brings that same relentless pursuit of truth to private clients—delivering clear answers in situations where the stakes are personal, financial, or legal. Whether supporting attorneys, businesses, or individuals, his work is defined by precision, discretion, and results.
Litigation Support & Case Development
We assist attorneys in building clear, fact-driven cases through structured investigative support and analysis.
Our work focuses on organizing complex information, verifying critical details, and identifying gaps that can impact case strategy. We prepare cases for negotiation, deposition, and trial with an emphasis on clarity, accuracy, and defensibility.
We translate complex facts into actionable intelligence that strengthens arguments and withstands scrutiny. By anticipating evidentiary challenges and uncovering overlooked details, we help legal teams reduce uncertainty and maintain control of the narrative.
Witness Location & Interviews
We locate and interview witnesses to uncover facts, clarify events, and develop reliable, defensible statements.
As a Certified Forensic Interviewer with the International Association of Interviewers—and a former FBI Supervisory Special Agent and professional journalist—we use advanced, structured techniques to elicit accurate information.
Our approach goes beyond taking a statement. We assess credibility, identify inconsistencies, and capture details that can materially influence case direction. Every interview is conducted professionally, ethically, and with a focus on producing clear, court-ready results.
Background & Due Diligence
We conduct comprehensive background and due diligence investigations to assess risk, verify information, and support informed decision-making.
Drawing on federal investigative experience, forensic interviewing expertise, and a journalist’s instinct for uncovering the full story, we examine both documented history and the context behind it.
Our work goes beyond surface-level records—identifying patterns, testing credibility, and uncovering potential areas of concern. We focus on delivering information that is not only accurate, but actionable. The result is a clear, objective assessment clients can rely on in legal, business, or personal matters.
Bug Sweeping Services
We provide Technical Surveillance Countermeasures (TSCM) services—commonly known as bug sweeps—to detect and neutralize hidden cameras, audio devices, and other forms of electronic surveillance.
Clients engage us when there is a concern that sensitive environments—homes, offices, boardrooms, or vehicles—may be compromised. Our work is discreet, methodical, and driven by a clear understanding of both technical real-world risk.
Based on the scope and threat assessment, we deploy appropriately sized teams on short notice. Each sweep is conducted with precision and discipline.
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Confidential 15-Minute Consultation - No Obligation
Let's discuss your case and determine the best path forward - quickly and discreetly.
Give me a call at 888-296-0660 or Click Below