Mark D. Seltzer

Mark D. Seltzer

Boston, MA recognized lawyers icon Recognized in Best Lawyers since 2010
Nixon Peabody LLP

199 Best Lawyers awards

Nixon Peabody LLP logo

Awarded Practice Areas

Criminal Defense: General Practice Criminal Defense: White-Collar

Biography

Mark Seltzer represents corporations, executives and professionals in government investigations and enforcement actions and related complex litigation.

What do you focus on?

In recent years, I have focused my practice on representing pharmaceutical companies and their executives, medical device manufacturers and their executives, clinical diagnostics manufacturers and other health care providers in government health care fraud investigations and related civil litigation under the federal False Claims Act and state counterparts; the federal Food, Drug and Cosmetic Act; the Medicare/Medicaid Anti-Kickback Statute; the Medicaid Drug Rebate Statute; and state consumer fraud statutes.

Outside the health care industry, I represent senior corporate executives in securities enforcement investigations, and financial institutions in various enforcement matters.

I have extensive experience in conducting confidential internal investigations for corporate clients. I regularly advise corporations on the design, implementation and monitoring of compliance programs.

Formerly, I was a federal prosecutor for 13 years both in Miami, as an Assistant United States Attorney for the Southern District of Florida and, in Boston, as Director of the New England Bank Fraud Task Force of the United States Department of Justice.

Nixon Peabody LLP

199 Best Lawyers awards

Nixon Peabody LLP logo

Overview

  • University of Pennsylvania, BA

  • Massachusetts, Massachusetts Bar Association
  • Pennsylvania, Pennsylvania Bar Association
  • Massachusetts, Massachusetts Bar Association
  • Pennsylvania, Pennsylvania Bar Association
  • University of Pennsylvania, BA

Client Testimonials

Awards & Focus

Recognized in The Best Lawyers in America® 2026 for work in:
  • Criminal Defense: General Practice
  • Criminal Defense: White-Collar
Additional Areas of Practice:
  • Commercial Litigation
  • Qui Tam Law
Special Focus:
  • White-Collar Criminal Defense

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