Daniel S. Marvin Partner

New York, NY

Phone: 646.870.1739 Fax: 212.804.7631 Download VCard

Daniel S. Marvin

Daniel is a partner in the New York office of Morrison Mahoney and co-leader of the firm’s Cybersecurity, Privacy and Data Protection team where he provides advisory services relating to the development, modification and implementation of written information security plans, employee data security policies, third-party vendor contracts and related corporate governance policies.  His practice also includes the counseling of clients in all aspects of data breach prevention, detection and mitigation, as well as regulatory compliance with international, federal and state privacy and data protection laws including the CCPA, GDPR , GLBA, HIPAA and the N.Y.S. Department of Financial Services cybersecurity regulation. Clients also turn to Daniel for assistance with cybersecurity and privacy assessments and training for employees and management on data handling, crisis management and breach response. In addition, Daniel represents clients in federal and state litigation, including the defense of class-action matters arising from data breaches. Daniel also advises clients with respect to cyber-insurance placement and coverage issues, and is experienced in assisting clients with regulatory inquiries arising from cyber incidents and breaches.

Daniel is a frequent speaker and author on cybersecurity and data privacy topics and trends, and is the Editor of the Morrison Mahoney Cybersecurity, Privacy and Data Protection Newsletter.  In addition, he is a Member of the Rutgers University Cybersecurity Advisory Board, where he provides input and leadership designed to enhance the school’s Cybersecurity Certificate Program.

Daniel is also a member of Morrison Mahoney’s Insurance Fraud & Forensic Investigations Group, as well as the firm’s Financial Institutions Litigation Group, and has extensive experience in the litigation of insurance and healthcare fraud actions, as well as in the representation of domestic and international financial institutions, insurance carriers, hedge funds, corporations, and individuals in litigation, mediation and arbitration matters.

Prior to joining private practice, Daniel served as an Assistant District Attorney in Bronx County, New York where he gained significant courtroom experience in the Office’s Criminal Court, Grand Jury and Trial Division Bureaus.

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New York, NY Office

Wall Street Plaza
88 Pine Street, Suite 1900
New York, NY 10005
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Areas of Practice

Bar Admissions

  • New York
  • New Jersey
  • United States District Court for the Southern District of New York
  • United States District Court for the Eastern District of New York
  • United States Court of Appeals for the Second Circuit


  • J.D. — The Maurice A. Deane School of Law at Hofstra University
  • B.A. — Hofstra University

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