Atty. Mark Harris Sidman

Atty. Mark Harris Sidman

Mr. Mark Harris Sidman is a lawyer practicing transportation, mergers and acquisitions, asset sales and 6 other areas of law.

Washington Washington 46 J. Erfahrung 46 year
Call (771) 203-1983 Book Appointment

Profile Summary

About Mark Harris Sidman at a glance

Mark Harris Sidman is a real estate, tax, m&a, and litigation attorney based in Washington, District of Columbia. They have 46+ years of legal experience, licensed to practice since 1980. Admitted to practice in Pennsylvania (1980) and District of Columbia (1982). Educated at University of Pittsburgh (J.D., 1980) and Hobart College (B.A., 1977). Recognitions include AV Preeminent. Active member of inactive, The District of Columbia Bar Pennsylvania Bar Association. Serands clients in Washington, DC and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

Über uns

  • Mr. Mark Harris Sidman is a lawyer practicing transportation, mergers and acquisitions, asset sales and 6 other areas of law
  • Mark received a B.A. degree from Hobart College in 1977, and has been licensed for 46 years
  • Mark practices in Washington, DC

Practice Areas Explained

Mark Harris Sidman's Areas of Practice

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

Real Estate Law

Real estate attorneys handle home purchases, sales, commercial transactions, title disputes, and landlord-tenant matters.

Mark Harris Sidman is one of 316,149 real estate attorneys indexed nationally. Browse real estate attorneys in District of Columbia →

Tax Law

Tax attorneys handle IRS audits, tax debt, international tax, estate planning, and tax court litigation.

Mark Harris Sidman is one of 85,302 tax attorneys indexed nationally. Browse tax attorneys in District of Columbia →

Mergers & Acquisitions

Mark Harris Sidman is one of 49,731 m&a attorneys indexed nationally. Browse m&a attorneys in District of Columbia →

Civil Litigation

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

Mark Harris Sidman is one of 454,532 litigation attorneys indexed nationally. Browse litigation 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 Harris Sidman

Where is Mark Harris Sidman's law office located?
Mark Harris Sidman's law practice is located in Washington, District of Columbia. You can contact the office directly through this profile page.
What practice areas does Mark Harris Sidman handle?
Mark Harris Sidman focuses on real estate, tax, m&a, litigation. Each practice area listed reflects experience handling cases of that type in District of Columbia.
How long has Mark Harris Sidman practiced law?
Mark Harris Sidman has 46+ years of legal experience and has been licensed since 1980.
Where did Mark Harris Sidman go to law school?
Mark Harris Sidman earned their education at (J.D., 1980); (B.A., 1977).
How can I contact Mark Harris Sidman for a consultation?
You can contact Mark Harris Sidman 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.
What awards or recognition has Mark Harris Sidman received?
Mark Harris Sidman's notable recognition includes: AV Preeminent.

Education

J.D.
University of Pittsburgh
- 1980
B.A.
Hobart College
- 1977

Awards

AV Preeminent

Bar Admissions

Pennsylvania
Admitted: 1980
District of Columbia
Admitted: 1982

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