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Jack S. Kallus is a partner focusing his practice on commercial litigation and cyber privacy law. He represents companies, investors, and local governments in proceedings throughout the country. He defends clients in a range of litigation matters including data security and privacy, breach of contract, business torts, fraud, deceptive trade practices, unfair competition, civil theft and Racketeer Influenced and Corrupt Organizations Act (RICO), consumer protection and bankruptcy, trust and probate litigation, as well as various maritime matters.

In Mr. Kallus’ e-discovery defense work, he consults with clients on preservation, collection, and production.  He uses extensive knowledge of electronic review platforms and tools to provide counsel on procedures to preserve, identify and collect electronic and hard copy information. He advises on best practices in handling e-discovery and the design of electronic filters and searches and manages personnel and business resources to ensure cost-effectiveness. He identifies the best processes for preservation, collection, and document review; negotiates e-discovery issues with opposing parties; establishes review protocols and quality controls for document review to create compliant logs. 

He helps clients navigate complex privacy laws in the complex areas of data privacy and cybersecurity. This includes compliance with General Data Protection Regulation (GDPR), the California Consumer Privacy Act (CCPA), and counseling clients during initial data breaches. Mr. Kallus has worked with multinational companies on global privacy data security policy development and has assisted in ensuring data collection and processing practices, data transfer procedures, privacy policies, and marketing activities, are all compliant with relevant domestic, international, privacy, and data security regulations.

Mr. Kallus has also represented Fortune 100 financial institutions and lenders in many financial litigation matters in both federal and state court, including disputes under TILA, RESPA, TCPA, KYC, BSA/AML, FCRA, ECOA, FDCPA, and in a variety of common law claims.

Prior to joining Kaufman Dolowich,  Mr. Kallus was a shareholder at a boutique law practice serving clients in New York, Colorado, Georgia, and Florida. He honed his litigation skills during his tenure as an Assistant State Attorney in the Miami-Dade County State Attorney’s Office.


  • Florida
  • Washington, D.C.
  • New York
  • Georgia
  • U.S. Court of Appeals, Eleventh Circuit
  •  U.S. Bankruptcy Courts
    •  Southern District of Florida
    • Middle District of Florida
  • U.S. District Court
    • Southern District of Florida
    • Middle District of Florida
    • Northern District of Florida
  •  U.S. District Court
    • Southern District of New York
    •   Eastern District of New York
  •  U.S. District Court
    • District of Colorado
  •  U.S. District Court
    • Northern District of Georgia


  • New York Law School, J.D.
  • Queens College, B.A., cum laude


  • Vice Chair, Business Law Section, Florida Bar Electronic Discovery & Digital Evidence Committee


  • Florida Super Lawyers Rising Star, 2014-2021
  •  Florida Bar Wm. Reece Smith, Jr. Leadership Academy Fellow, 2020-2021
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