Atty. Mark P. Leddy

Atty. Mark P. Leddy

Mr. Mark P.

Washington Washington 55 yrs experience 55 year
Call (771) 474-1375 Book Appointment

Profile Summary

About Mark P. Leddy at a glance

Mark P. Leddy is a Partner based in Washington, District of Columbia, practicing at Cleary Gottlieb Steen Hamilton Llp. They have 55+ years of legal experience, licensed to practice since 1971. Their practice focuses on criminal defense, m&a, and adr. Admitted to practice in Massachusetts (1971) and District of Columbia (1986). Educated at Boston College Law School (J.D., 1971) and Boston College (B.A., 1968). Recognitions include AV Preeminent. Active member of The District of Columbia Bar. Serands clients in Washington, DC and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mr. Mark P. Leddy is a lawyer practicing criminal defense, mergers & acquisitions, antitrust and competition and 1 other area of law
  • Mark received a B.A. degree from Boston College in 1968, and has been licensed for 55 years
  • Mark practices at Cleary Gottlieb Steen & Hamilton LLP in Washington, DC

Practice Areas Explained

Mark P. Leddy's Areas of Practice

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

Criminal Defense

A criminal defense attorney protects your rights from arrest through trial. Find experienced lawyers handling DUI, drug, federal, theft, and violent-crime charges.

Mark P. Leddy is one of 214,270 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in District of Columbia →

Mergers & Acquisitions

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

Mediation & Arbitration

Mediators and arbitrators for civil, commercial, family, and employment dispute resolution.

Mark P. Leddy is one of 73,906 adr attorneys indexed nationally. Browse adr 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 P. Leddy

Where is Mark P. Leddy's law office located?
Mark P. Leddy's law practice is located in Washington, District of Columbia. The firm is Cleary Gottlieb Steen Hamilton Llp. You can contact the office directly through this profile page.
What practice areas does Mark P. Leddy handle?
Mark P. Leddy focuses on criminal defense, m&a, adr. Each practice area listed reflects experience handling cases of that type in District of Columbia.
How long has Mark P. Leddy practiced law?
Mark P. Leddy has 55+ years of legal experience and has been licensed since 1971.
Where did Mark P. Leddy go to law school?
Mark P. Leddy earned their education at (J.D., 1971); (B.A., 1968).
How can I contact Mark P. Leddy for a consultation?
You can contact Mark P. Leddy 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 P. Leddy received?
Mark P. Leddy's notable recognition includes: AV Preeminent.

Education

J.D.
Boston College Law School
- 1971
B.A.
Boston College
- 1968

Awards

AV Preeminent

Bar Admissions

Massachusetts
Admitted: 1971
District of Columbia
Admitted: 1986

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