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4th Dimension Investigative and Security Solutions, LLC

Boutique security and investigative consulting firm, focusing on timely and comprehensive results. Leveraging the 4th dimension of critical data and decades of federal law enforcement and intelligence community experience to provide the customized results you deserve. Specializing in insider threat, FARA analysis, internal investigations, digital forensics, litigation support, due diligence, employee misconduct, security consulting, and more.

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Tailored solutions and support to mitigate risk and help you rest easy.

4DISS Investigations and Intelligence

Investigations and Intelligence

  • Digital Forensic and Incident Response (DFIR)
  • Insider Threat investigations
  • Internal investigations including:
  • Employee misconduct
  • Corporate compliance
  • Anti-fraud and anti-corruption investigations
  • Due diligence investigations
  • Threat intelligence
  • Business intelligence services including:
4DISS Security and Solutions

Security Solutions and Support

  • Civil Litigation Support
  • Criminal Investigative Support
  • Subject Matter Expert (SME) Consulting
  • Risk assessment and emergency action planning
  • Personnel training:
  • Active Shooter and Personnel Safety
  • Situational and security awareness
  • Operational Security (OPSEC)
  • International Travel and Risk
  • Executive protection:
  • GPS equipped vehicles
  • CPR and First Aid trained personnel
  • AED equipped vehicles
4DISS Analysis and Assessments

Analysis and Assessments

  • Digital Forensic Analysis
  • Cellphones
  • Computers
  • Cloud
  • On-site expedited analysis available
  • Password cracking and file decryption services available
  • Detailed analytical reporting of findings
  • eDiscovery
  • Vulnerability Security Assessments
  • FARA Analysis and Consulting
  • Internal corporate compliance
  • Anti-Money Laundering Compliance
  • Investment Intelligence (scam avoidance)


We Have the Expertise You’ve Been Looking For

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4DISS is a boutique investigative and security consulting firm founded by a dynamic and innovative leader with a distinguished career in federal law enforcement and the intelligence community. 4DISS focuses on timely and comprehensive results, harnessing decades of demonstrated experience to identify what superficial investigations miss. Let us assist your team by leveraging the 4th dimension of critical data to provide tailored solutions that address your specific needs in the areas of insider threat, internal investigations, digital forensics and incident response (DFIR), FARA analysis, OSINT, financial investigations, employee misconduct, litigation support, and more.

We manage critical services in-house (including DFIR tools for computers and cellphones) and utilize strict data security measures to ensure your information remains private. Contact us for a consultation today.

Harry A. Lidsky (Founder)

Harry is a dynamic and innovative leader with a distinguished career in federal law enforcement and the intelligence community. During his more than 24 years of government service, Harry identified a need for tailored and creative security solutions. Prior to starting 4DISS, Harry served in various senior leadership positions within the U.S. government.

From March 2010 – September 2023, Harry worked for the Department of Justice – Office of the Inspector General, serving as a Senior Special Agent, Assistant Special Agent in Charge, and Special Agent in Charge of the Cyber Investigations Office. In those capacities at DOJ-OIG, Harry performed computer and mobile device forensic analysis, initiated insider threat investigations, conducted financial analysis, and conducted surveillance, technical, and undercover operations in furtherance of criminal investigations. As SAC, Harry led the DOJ-OIG team of insider threat, cyber security and digital forensic experts who investigate and prosecute cyber crimes affecting the Department of Justice and was responsible for the day-to-day operations of the DOJ-OIG office. Prior to joining DOJ-OIG, Harry spent over 10 years working in the intelligence community and as a Special Agent with the Drug Enforcement Administration. During that time, Harry executed hundreds of search warrants, arrests, seziures, and other enforcement actions; performed comprehensive electronic surveillance, including wiretaps; and conducted undercover operations.

Harry has testified at more than 200 federal proceedings, including jury trials, hearings, and grand jury inquiries.

Learn more about some of Harry’s casework in the “Featured” section on his LinkedIn page here:



We are ready to help

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We are located in Ashburn, Virginia, in the Washington D.C. area, providing security and investigative consulting and SME services worldwide. Contact us for a discreet consultation to discuss your requirements. You can reach us by email, phone, text or secure messaging, by clicking on the links below:


202-804-DISS (202-804-3477)

866-304-DISS (866-304-3477)




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We do not use trackers or ask for personal information on this site. We do not sell data or contact information. We do not share data or contact information unless legally obligated and compelled to do so.