Atty. Mark Christopher Nielsen

Atty. Mark Christopher Nielsen

Mark Christopher Nielsen is a lawyer practicing health care, litigation, fiduciary responsibility and 3 other areas of law. Mark received a B.A. degree from Indiana University in 1992, and has been licensed for 29 years.

Washington Washington 29 yrs experience 29 year
Call (202) 367-9055 Book Appointment

Profile Summary

About Mark Christopher Nielsen at a glance

Mark Christopher Nielsen is a Principal based in Washington, District of Columbia, practicing at Groom Law Group Chartered. They have 29+ years of legal experience, licensed to practice since 1997. Their practice focuses on estate litigation, litigation, and health care. Admitted to practice in New York (1997), District of Columbia (2000), U.S. Supreme Court (2000), and U.S. District Court, Northern District of Illinois and U.S. District Court, District of Columbia (2004). Educated at Georgetown University law Center (LL.M. Labor, 1997) and Indiana University (B.A., 1992). Serands clients in Washington, DC and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mark Christopher Nielsen is a lawyer practicing health care, litigation, fiduciary responsibility and 3 other areas of law
  • Mark received a B.A. degree from Indiana University in 1992, and has been licensed for 29 years
  • Mark practices at Groom Law Group, Chartered in Washington, DC

Practice Areas Explained

Mark Christopher Nielsen's Areas of Practice

Each practice area below reflects the types of cases Mark Christopher Nielsen handles, with a brief overview of what that area of law covers.

Estate & Trust Litigation

Mark Christopher Nielsen is one of 20,023 estate litigation attorneys indexed nationally. Browse estate litigation attorneys in District of Columbia →

Civil Litigation

Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.

Mark Christopher Nielsen is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in District of Columbia →

Health Care Law

Health care attorneys for HIPAA, Medicare, Medicaid, regulatory compliance, and medical licensing matters.

Mark Christopher Nielsen is one of 66,735 health care attorneys indexed nationally. Browse health care attorneys in District of Columbia →

Jurisdictional Context

Why local counsel matters in District of Columbia

Practicing law in District of Columbia. Legal matters in District of Columbia are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Washington are typically filed in the local municipal court or the appropriate District of Columbia state district court, depending on subject matter and amount in controversy. An attorney licensed in District of Columbia brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in District of Columbia courts without local counsel or pro hac vice admission.

Looking for additional District of Columbia attorneys? Browse all attorneys in Washington or all attorneys in District of Columbia.

Frequently Asked

Common questions about Mark Christopher Nielsen

Where is Mark Christopher Nielsen's law office located?
Mark Christopher Nielsen's law practice is located in Washington, District of Columbia. The firm is Groom Law Group Chartered. You can contact the office directly through this profile page.
What practice areas does Mark Christopher Nielsen handle?
Mark Christopher Nielsen focuses on estate litigation, litigation, health care. Each practice area listed reflects experience handling cases of that type in District of Columbia.
How long has Mark Christopher Nielsen practiced law?
Mark Christopher Nielsen has 29+ years of legal experience and has been licensed since 1997.
Where did Mark Christopher Nielsen go to law school?
Mark Christopher Nielsen earned their education at (LL.M. Labor, 1997); (B.A., 1992).
How can I contact Mark Christopher Nielsen for a consultation?
You can contact Mark Christopher Nielsen directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Education

LL.M. Labor
Georgetown University law Center
- 1997
B.A.
Indiana University
- 1992

Bar Admissions

New York
Admitted: 1997
District of Columbia
Admitted: 2000
U.S. Supreme Court
Admitted: 2000
U.S. District Court, Northern District of Illinois and U.S. District Court, District of Columbia
Admitted: 2004
U.S. Court of Appeals, Second Circuit U.S. Court of Appeals, Ninth Circuit U.S. District Court, East
Admitted: 2007

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