Atty. Mark D. Seltzer
Mark Seltzer represents corporations, executives and professionals in government investigations and enforcement actions and related complex litigation. What do you focus on?
Criminal Defense: General Practice & More Attorney · Serving Boston, MA
Profile Summary
About Mark D. Seltzer at a Glance
Mark D. Seltzer is a criminal defense and white collar attorney based in Boston, Massachusetts, practicing at Nixon Peabody LLP. Admitted to practice in Massachusetts, Massachusetts Bar Association and Pennsylvania, Pennsylvania Bar Association. Educated at University of Pennsylvania (BA). Recognitions include Best Lawyers in America — Criminal Defense: General Practice (2026), Best Lawyers in America — Criminal Defense: White-Collar (2026), and Best Lawyers in America — Additional Areas of Practice: (2026). Serves clients in Boston, MA and the surrounding metropolitan area.
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About Mark D. Seltzer
- 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
Practice Areas Explained
Mark D. Seltzer's Areas of Legal Practice
Each practice area below reflects the types of cases Mark D. Seltzer handles, with a practical overview of what that area of law involves and how it may apply to your situation in Boston.
Criminal Defense in Boston
A criminal defense attorney protects your rights from arrest through trial. Find experienced lawyers handling DUI, drug, federal, theft, and violent-crime charges.
Mark D. Seltzer is one of 212,605 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in Massachusetts →
White Collar Crimes in Boston
Mark D. Seltzer is one of 19,824 white collar attorneys indexed nationally. Browse white collar attorneys in Massachusetts →
Jurisdictional Context
Why Local Counsel Matters in Boston
Practicing law in Massachusetts. Legal matters in Massachusetts are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Boston are typically filed in the local municipal court or the appropriate Massachusetts state district court, depending on subject matter and amount in controversy. An attorney licensed in Massachusetts brings working knowledge of local procedural deadlines, judicial practices in this venue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Massachusetts courts without local counsel or pro hac vice admission.
Boston Courts and Legal Process
Choosing a Boston-based attorney means your counsel already knows the local docketing timelines, preferred filing formats, and how individual judges typically rule on procedural motions — details that only come from practicing in this jurisdiction day after day. That local familiarity can translate to better strategy, faster filings, and fewer costly surprises.
Looking for additional Massachusetts attorneys? Browse all attorneys in Boston or all attorneys in Massachusetts.
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Professional Profile
Why Clients in Boston Choose Mark D. Seltzer
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish Mark D. Seltzer's practice in the field of criminal defense and white collar.
Multi-State Bar Admission
Licensed in Massachusetts, Massachusetts Bar Association and Pennsylvania, Pennsylvania Bar Association, Mark D. Seltzer can represent clients in cases that span state lines or require counsel in multiple jurisdictions.
Broad Practice Area Coverage
Covering criminal defense and white collar, Mark D. Seltzer can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Boston
A Boston-based practice means Mark D. Seltzer attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
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Mark D. Seltzer's Practice Areas & Specializations
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