Atty. Mark J. Feldstein
Mark J. Feldstein is a lawyer practicing patents, patent litigation, trade secrets and 4 other areas of law.
Patent Litigation & More Attorney · Serving Washington, DC · 25+ Years Experience
Profile Summary
About Mark J. Feldstein at a Glance
Mark J. Feldstein is a Partner based in Washington, District of Columbia, practicing at Finnegan Henderson Farabow Garrett And Dunner L L P. They have 25+ years of legal experience, licensed to practice since 2001. Their practice focuses on patent and trade secrets. Admitted to practice in Maryland (2001) and District of Columbia registered to practice before U.S. Patent and Trademark Office (2002). Educated at Georgetown University Law Center (J.D., 2001) and The George Washington University (B.S., 1991). Recognitions include BV Distinguished. Serves clients in Washington, DC and the surrounding metropolitan area.
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About Mark J. Feldstein
- Mark J. Feldstein is a lawyer practicing patents, patent litigation, trade secrets and 4 other areas of law
- Mark received a B.S. degree from The George Washington University in 1991, and has been licensed for 25 years
- Mark practices at Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P. in Washington, DC
Practice Areas Explained
Mark J. Feldstein's Areas of Legal Practice
Each practice area below reflects the types of cases Mark J. Feldstein handles, with a practical overview of what that area of law involves and how it may apply to your situation in Washington.
Patent Law in Washington
Mark J. Feldstein is one of 20,632 patent attorneys indexed nationally. Browse patent attorneys in District of Columbia →
Trade Secrets in Washington
Mark J. Feldstein is one of 6,604 trade secrets attorneys indexed nationally. Browse trade secrets 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 J. Feldstein
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 J. Feldstein's practice in the field of patent and trade secrets.
Decade-Tested Legal Experience
Mark J. Feldstein brings 25+ 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 Maryland and District of Columbia registered to practice before U.S. Patent and Trademark Office, Mark J. Feldstein can represent clients in cases that span state lines or require counsel in multiple jurisdictions.
Broad Practice Area Coverage
Covering patent and trade secrets, Mark J. Feldstein 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 J. Feldstein 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 J. Feldstein Online
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Mark J. Feldstein's Practice Areas & Specializations
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