David Kalat is a professional investigator and a testifying expert in information science and electronic evidence. His work includes digital forensics, data analytics, and information security.

Mr. Kalat has been qualified as an expert in electronic evidence and digital forensics in civil and criminal matters in state and US federal courts. He has testified in bench and jury trials, class certification hearings, arbitrations, preliminary injunction hearings, and spoliation disputes. He testifies often in putative class actions involving data privacy laws, such as the Telephone Consumer Protection Act (TCPA), Biometric Information Privacy Act (BIPA), Fair Credit Reporting Act (FCRA), and Computer Fraud and Abuse Act. He has given evidence regarding technical aspects of automatic telephone dialers, biometric authentication systems, video surveillance systems, and relational database design.

Mr. Kalat is a Certified Fraud Examiner (CFE), Certified Computer Examiner (CCE), Certified Information Systems Security Professional (CISSP), Certified Telecommunications Analyst (CTA), licensed private detective, and nonfiction author. His monthly series for LegalTech News, “Nervous System,” approaches issues of data privacy and cybersecurity from the context of history—to look to the past for clues about how to interpret the present and prepare for the future. His article on the history of the TCPA’s autodialer definition, “How to Recognize Different Types of Dialers From Quite a Long Way Away,” published in The Consumer Finance Law Quarterly Report, was cited in the judicial opinion denying class certification in Meier v. Allied Interstate (S.D. Calif., 2020).

Mr. Kalat is an active member of the Sedona Conference, with a particular focus on the Data Security and Privacy Liability Working Group. He serves on the board of directors of the Chicago Chapter of the Association of Certified Fraud Examiners.

Mr. Kalat holds a master’s degree in library and information science from the University of Illinois at Urbana-Champaign. He earned a bachelor’s degree from the University of Michigan.

Employment History

Duff & Phelps
Director, Disputes and Investigations
2011 – 2015

Professional Affiliations

Association of Certified Fraud Examiners
Chicago Chapter Member

Forensic Expert Witness Association

Chicago Area Litigation Support Managers

Illinois Private Detective License
#115 002487

International Society of Forensic Computer Examiners

Areas of Expertise


University of Illinois
MLIS, Library and Information Science, 2011

University of Michigan
BA, Film and Video Studies, 1992


Who’s Who Legal: Global Leader

  • Data Expert 2021, 2022
“He is a well-rounded subject matter expert, combining technical knowledge, communication skills, project management and practical problem solving.”
  • Digital & Data Forensic Experts 2019, 2020, 2021

“David Kalat receives glowing praise for his ‘ability to consider how to achieve the client’s goals in the most efficient way possible’.”