Atty. Mark John Nahnsen

Atty. Mark John Nahnsen

Mark John Nahnsen is a lawyer practicing credit repair, lawsuits / disputes, intellectual property and 10 other areas of law. Mark received a B.S. degree from Purdue University in 1994, and has been licensed for 26 years.

Chicago Chicago 26 yrs experience 26 year
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Profile Summary

About Mark John Nahnsen at a glance

Mark John Nahnsen is a Partner based in Chicago, Illinois, practicing at Barnes & Thornburg LLP. They have 26+ years of legal experience, licensed to practice since 2000. Their practice focuses on trademark, business, ip, litigation, and entertainment. Educated at John Marshall (J.D., 1999) and Purdue University (B.S., 1994). Serands clients in Chicago, IL and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mark John Nahnsen is a lawyer practicing credit repair, lawsuits / disputes, intellectual property and 10 other areas of law
  • Mark received a B.S. degree from Purdue University in 1994, and has been licensed for 26 years
  • Mark practices at Barnes & Thornburg LLP in Chicago, IL

Practice Areas Explained

Mark John Nahnsen's Areas of Practice

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

Trademark Law

Mark John Nahnsen is one of 23,222 trademark attorneys indexed nationally. Browse trademark attorneys in Illinois →

Business & Corporate Law

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

Mark John Nahnsen is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Illinois →

Intellectual Property

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

Mark John Nahnsen is one of 106,079 ip attorneys indexed nationally. Browse ip attorneys in Illinois →

Civil Litigation

Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.

Mark John Nahnsen is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in Illinois →

Entertainment & Sports Law

Entertainment lawyers for music, film, sports contracts, talent representation, and IP licensing.

Mark John Nahnsen is one of 45,946 entertainment attorneys indexed nationally. Browse entertainment attorneys in Illinois →

Jurisdictional Context

Why local counsel matters in Illinois

Practicing law in Illinois. Legal matters in Illinois are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Chicago are typically filed in the local municipal court or the appropriate Illinois state district court, depending on subject matter and amount in controversy. An attorney licensed in Illinois 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 Illinois courts without local counsel or pro hac vice admission.

Looking for additional Illinois attorneys? Browse all attorneys in Chicago or all attorneys in Illinois.

Frequently Asked

Common questions about Mark John Nahnsen

Where is Mark John Nahnsen's law office located?
Mark John Nahnsen's law practice is located in Chicago, Illinois. The firm is Barnes & Thornburg LLP. You can contact the office directly through this profile page.
What practice areas does Mark John Nahnsen handle?
Mark John Nahnsen focuses on trademark, business, ip, litigation, entertainment. Each practice area listed reflects experience handling cases of that type in Illinois.
How long has Mark John Nahnsen practiced law?
Mark John Nahnsen has 26+ years of legal experience and has been licensed since 2000.
Where did Mark John Nahnsen go to law school?
Mark John Nahnsen earned their education at (J.D., 1999); (B.S., 1994).
How can I contact Mark John Nahnsen for a consultation?
You can contact Mark John Nahnsen 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.

Education

J.D.
John Marshall
- 1999
B.S.
Purdue University
- 1994

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