Atty. Mark S. Sullivan
Mark S. Sullivan is a lawyer practicing intellectual property litigation, international arbitration and litigation, securities litigation and enforcement and 1 other area of law.
Intellectual Property Litigation & More Attorney · Serving New York, NY · 41+ Years Experience
Profile Summary
About Mark S. Sullivan at a Glance
Mark S. Sullivan is a Partner based in New York, New York, practicing at Dorsey & Whitney LLP. They have 41+ years of legal experience, licensed to practice since 1985. Their practice focuses on ip, white collar, litigation, adr, and international. Admitted to practice in New York U.S. Supreme Court U.S. District Court, Southern District of New York U.S. District Court, (1985). Educated at Brooklyn Law School (J.D., 1984) and Dartmouth College (A.B. English, 1980). Recognitions include Peer Reviewed. Serves clients in New York, NY and the surrounding metropolitan area.
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About Mark S. Sullivan
- Mark S. Sullivan is a lawyer practicing intellectual property litigation, international arbitration and litigation, securities litigation and enforcement and 1 other area of law
- Mark received a A.B. degree from Dartmouth College in 1980, and has been licensed for 41 years
- Mark practices at Dorsey & Whitney LLP in New York, NY
Practice Areas Explained
Mark S. Sullivan's Areas of Legal Practice
Each practice area below reflects the types of cases Mark S. Sullivan handles, with a practical overview of what that area of law involves and how it may apply to your situation in New York.
Intellectual Property in New York
IP attorneys protect inventions, brands, and creative work through patent prosecution, trademark registration, copyright, and trade-secret enforcement.
Mark S. Sullivan is one of 105,285 ip attorneys indexed nationally. Browse ip attorneys in New York →
White Collar Crimes in New York
Mark S. Sullivan is one of 19,824 white collar attorneys indexed nationally. Browse white collar attorneys in New York →
Civil Litigation in New York
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
Mark S. Sullivan is one of 450,751 litigation attorneys indexed nationally. Browse litigation attorneys in New York →
Mediation & Arbitration in New York
Mediators and arbitrators for civil, commercial, family, and employment dispute resolution.
Mark S. Sullivan is one of 73,315 adr attorneys indexed nationally. Browse adr attorneys in New York →
International Law in New York
International law attorneys for cross-border transactions, trade, foreign investment, and treaties.
Mark S. Sullivan is one of 39,787 international attorneys indexed nationally. Browse international attorneys in New York →
Jurisdictional Context
Why Local Counsel Matters in New York
Practicing law in New York. Legal matters in New York are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in New York are typically filed in the local municipal court or the appropriate New York state district court, depending on subject matter and amount in controversy. An attorney licensed in New York 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 New York courts without local counsel or pro hac vice admission.
New York Courts and Legal Process
Choosing a New York-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.
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Professional Profile
Why Clients in New York Choose Mark S. Sullivan
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 S. Sullivan's practice in the field of ip, white collar, litigation, adr, and international.
Decade-Tested Legal Experience
Mark S. Sullivan brings 41+ years of hands-on legal practice — enough to have navigated the recurring fact patterns, procedural traps, and negotiation dynamics that shape case outcomes.
Broad Practice Area Coverage
Covering ip, white collar, and litigation, Mark S. Sullivan can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in New York
A New York-based practice means Mark S. Sullivan attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
Case Types
Common Legal Issues Mark S. Sullivan Handles in New York
Below is a representative sample of the types of matters Mark S. Sullivan has experience with under New York law. If your situation involves one of these case categories, this attorney may be well positioned to help you understand your options.
This list is illustrative, not exhaustive. Contact Mark S. Sullivan directly to discuss the specifics of your situation.
Search Reference
How People Find Mark S. Sullivan Online
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Mark S. Sullivan's Practice Areas & Specializations
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