Antitrust And Competition & More Attorney · Serving Washington, DC · 55+ Years Experience
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. Serves clients in Washington, DC and the surrounding metropolitan area.
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About Mark P. Leddy
- 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 Legal Practice
Each practice area below reflects the types of cases Mark P. Leddy handles, with a practical overview of what that area of law involves and how it may apply to your situation in Washington.
Criminal Defense in Washington
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 212,605 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in District of Columbia →
Mergers & Acquisitions in Washington
Mark P. Leddy is one of 49,430 m&a attorneys indexed nationally. Browse m&a attorneys in District of Columbia →
Mediation & Arbitration in Washington
Mediators and arbitrators for civil, commercial, family, and employment dispute resolution.
Mark P. Leddy is one of 73,315 adr attorneys indexed nationally. Browse adr attorneys in District of Columbia →
Jurisdictional Context
Why Local Counsel Matters in Washington
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 venue, 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.
Washington Courts and Legal Process
Choosing a Washington-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 District of Columbia attorneys? Browse all attorneys in Washington or all attorneys in District of Columbia.
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Professional Profile
Why Clients in Washington Choose Mark P. Leddy
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 P. Leddy's practice in the field of criminal defense, m&a, and adr.
Decade-Tested Legal Experience
Mark P. Leddy brings 55+ years of hands-on legal practice — enough to have navigated the recurring fact patterns, procedural traps, and negotiation dynamics that shape case outcomes.
Multi-State Bar Admission
Licensed in Massachusetts and District of Columbia, Mark P. Leddy can represent clients in cases that span state lines or require counsel in multiple jurisdictions.
Broad Practice Area Coverage
Covering criminal defense, m&a, and adr, Mark P. Leddy can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Washington
A Washington-based practice means Mark P. Leddy 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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How People Find Mark P. Leddy Online
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Mark P. Leddy's Practice Areas & Specializations
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