Atty. Dennis C. Thelen

Atty. Dennis C. Thelen

Dennis C. Thelen is a lawyer practicing international trade law, commercial law, intellectual property law.

Washington Washington 58 J. Erfahrung 58 year
Call (404) 689-5892 Book Appointment

Profile Summary

About Dennis C. Thelen at a glance

Dennis C. Thelen is a business, real estate, ip, and international attorney based in Washington, District of Columbia. They have 58+ years of legal experience, licensed to practice since 1968. Admitted to practice in New York (1968), District of Columbia (1981), and U. S. District Court for the District of Columbia (1981). Educated at University of Notre Dame (J.D., 1968) and Iona College (B.A., 1965). Recognitions include AV Preeminent. Serands clients in Washington, DC and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

Über uns

  • Dennis C. Thelen is a lawyer practicing international trade law, commercial law, intellectual property law
  • Dennis C. received a B.A. degree from Iona College in 1965, and has been licensed for 58 years
  • Dennis C. practices in Washington, DC

Practice Areas Explained

Dennis C. Thelen's Areas of Practice

Each practice area below reflects the types of cases Dennis C. Thelen handles, with a brief overview of what that area of law covers.

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

Dennis C. Thelen is one of 501,317 business attorneys indexed nationally. Browse business attorneys in District of Columbia →

Real Estate Law

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

Dennis C. Thelen is one of 316,149 real estate attorneys indexed nationally. Browse real estate attorneys in District of Columbia →

Intellectual Property

IP attorneys protect inventions, brands, and creative work through patent prosecution, trademark registration, copyright, and trade-secret enforcement.

Dennis C. Thelen is one of 106,079 ip attorneys indexed nationally. Browse ip attorneys in District of Columbia →

International Law

International law attorneys for cross-border transactions, trade, foreign investment, and treaties.

Dennis C. Thelen is one of 40,133 international attorneys indexed nationally. Browse international 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 Dennis C. Thelen

Where is Dennis C. Thelen's law office located?
Dennis C. Thelen's law practice is located in Washington, District of Columbia. You can contact the office directly through this profile page.
What practice areas does Dennis C. Thelen handle?
Dennis C. Thelen focuses on business, real estate, ip, international. Each practice area listed reflects experience handling cases of that type in District of Columbia.
How long has Dennis C. Thelen practiced law?
Dennis C. Thelen has 58+ years of legal experience and has been licensed since 1968.
Where did Dennis C. Thelen go to law school?
Dennis C. Thelen earned their education at (J.D., 1968); (B.A., 1965).
How can I contact Dennis C. Thelen for a consultation?
You can contact Dennis C. Thelen 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 Dennis C. Thelen received?
Dennis C. Thelen's notable recognition includes: AV Preeminent.

Education

J.D.
University of Notre Dame
- 1968
B.A.
Iona College
- 1965

Awards

AV Preeminent

Bar Admissions

New York
Admitted: 1968
District of Columbia
Admitted: 1981
U. S. District Court for the District of Columbia
Admitted: 1981

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