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

    Bar Admissions

      • Florida
      • Washington, D.C.
      • New York
      • Georgia

    Court Admissions

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



Jack S. Kallus is a Shareholder in Becker’s Business Litigation Practice. A highly regarded civil litigation attorney, he provides representation to businesses and individuals throughout Florida and New York, as well as in other parts of the world. Mr. Kallus handles complex commercial litigation matters in both state and federal court representing multinational clients in a wide array of industries.

Mr. Kallus has represented companies, investors, and sovereign states in proceedings throughout the country. He represents clients in a range of litigations including data security and privacy, breach of contract, business torts, fraud, deceptive trade practices, unfair competition, civil theft and RICO, consumer protection and bankruptcy, trust and probate litigation, insurance defense issues involving insurance coverage and personal injury, as well as various maritime matters.

Mr. Kallus has a broad background in e-discovery and consults with clients on preservation, collection and production issues in large litigation matters. Mr. Kallus has extensive knowledge of various electronic review platforms and tools; defensible and efficient procedures to preserve, identify and collect electronic and hard copy information; best practices in handling e-discovery and the design of electronic filters and searches, as well as his ability to manage personnel and resources to ensure cost-effectiveness. Mr. Kallus has experience identifying the best process for preservation, collection and document review; negotiating e-discovery issues with the opposing party; establishing review protocols and a quality control processes for the document review; creating a robust and defensible privilege log; and handling all other aspects of the discovery process.

Mr. Kallus also has experience counseling clients in the complex areas of data privacy and cybersecurity, helping clients navigate complex privacy laws, including GDPR, and has counseled clients during the initial stages on several data breaches. Mr. Kallus works with multinational companies on global privacy data security policy development and has assisted companies in ensuring that their data collection and processing practices, data transfer procedures, privacy policies, and marketing activities are compliant with the relevant domestic, international, privacy, and data security regulations and laws.

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

Mr. Kallus honed his litigation skills during his tenure as an Assistant State Attorney in the Miami-Dade County State Attorney’s Office. There he investigated and prosecuted crimes arising under Florida statutes ranging from simple grand thefts to highly complex conspiracies, identity thefts, money laundering, and RICO charges. Mr. Kallus was appointed as the youngest member of the Miami-Dade State Attorney’s Mortgage Fraud Unit. Prior to joining Becker, Mr. Kallus also practiced at a prominent Fort Lauderdale trial boutique firm and an Am-Law 100 firm.


  • Super Lawyers, Rising Star, 2014 – present
  • Attorney at Law Magazine, Super Star, 2018


  • The Florida Bar, Wm. Reece Smith, Jr. Leadership Academy, Fellow, 2020-21