Mark E. Schreiber - McDermott Will & Emery


Mark E. Schreiber focuses his practice on cybersecurity, data breach response and global privacy coordination. He advises entities facing cross-border data protection, the General Data Protection Regulation (GDPR), Privacy Shield and related issues, strategic decisions, cyber assessments and investigations. Mark has led numerous multi-national and cross-border matters, including those involving data breaches, data transfer and credit card/PCI matters. He has advised senior management, boards, and special board committees on a variety of investigations, including data breach prevention and response.

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  • Represented numerous retailers, financial services, travel and web companies in data breaches and related security incidents of credit card and other personal information disclosures, forensic engagement and oversight, breach notification to individuals, regulators and law enforcement, and resolutions with state Attorneys Generals and other agencies
  • Litigation monitoring counsel for cyber insurer in case of major national breach by insured of credit card and other data
  • Defense of various companies involving alleged violation of “ZIP Code” and other data collection statutes at point of sale, in class actions and pre-litigation claim letters

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  • The Best Lawyers in America, Privacy and Data Security Law, 2019 to 2024
  • The Best Lawyers in America, Labor and Employment Law and Employment Law – Individuals, 1987 to 2023
  • The Legal 500 United States, 2018

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  • Chair, Privacy and Data Protection Group – World Law Group (2003-2016)
  • Co-Chair, Boston Bar Association Privacy Law Committee (2007-09, 2014-2017)
  • Arbitrator and Mediator, American Arbitration Association (AAA) (Commercial/Labor and Employment panel)
  • Member, International Association of Privacy Professionals


Harvard Law School, JD, 1972
University of Michigan, BA, with Distinction, 1969


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