Atty. Cornelius James Tanis

Atty. Cornelius James Tanis

Cornelius James Tanis is a lawyer practicing intellectual property, commercial, contracts & agreements and 8 other areas of law. Cornelius received a B.A. degree from Calvin College in 1980, and has been licensed for 43 years.

Chicago Chicago 43 yrs experience 43 year
Call (970) 286-0899 Book Appointment

Profile Summary

About Cornelius James Tanis at a glance

Cornelius James Tanis is a Partner based in Chicago, Illinois, practicing at Freeborn & Peters LLP. They have 43+ years of legal experience, licensed to practice since 1983. Their practice focuses on formation, contracts, business, ip, and tax. Admitted to practice in Illinois (1983) and New Jersey (1986). Educated at Rutgers University Law School, Camden (J.D., 1983) and Calvin College (B.A., 1980). Recognitions include AV Preeminent. Serands clients in Chicago, IL and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Cornelius James Tanis is a lawyer practicing intellectual property, commercial, contracts & agreements and 8 other areas of law
  • Cornelius received a B.A. degree from Calvin College in 1980, and has been licensed for 43 years
  • Cornelius practices at Freeborn & Peters LLP in Chicago, IL

Practice Areas Explained

Cornelius James Tanis's Areas of Practice

Each practice area below reflects the types of cases Cornelius James Tanis handles, with a brief overview of what that area of law covers.

Business Formation

Cornelius James Tanis is one of 35,584 formation attorneys indexed nationally. Browse formation attorneys in Illinois →

Contracts

Cornelius James Tanis is one of 76,762 contracts attorneys indexed nationally. Browse contracts attorneys in Illinois →

Business & Corporate Law

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

Cornelius James Tanis 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.

Cornelius James Tanis is one of 106,079 ip attorneys indexed nationally. Browse ip attorneys in Illinois →

Tax Law

Tax attorneys handle IRS audits, tax debt, international tax, estate planning, and tax court litigation.

Cornelius James Tanis is one of 85,302 tax attorneys indexed nationally. Browse tax 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 Cornelius James Tanis

Where is Cornelius James Tanis's law office located?
Cornelius James Tanis's law practice is located in Chicago, Illinois. The firm is Freeborn & Peters LLP. You can contact the office directly through this profile page.
What practice areas does Cornelius James Tanis handle?
Cornelius James Tanis focuses on formation, contracts, business, ip, tax. Each practice area listed reflects experience handling cases of that type in Illinois.
How long has Cornelius James Tanis practiced law?
Cornelius James Tanis has 43+ years of legal experience and has been licensed since 1983.
Where did Cornelius James Tanis go to law school?
Cornelius James Tanis earned their education at (J.D., 1983); (B.A., 1980).
How can I contact Cornelius James Tanis for a consultation?
You can contact Cornelius James Tanis 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 Cornelius James Tanis received?
Cornelius James Tanis's notable recognition includes: AV Preeminent.

Education

J.D.
Rutgers University Law School, Camden
- 1983
B.A.
Calvin College
- 1980

Awards

AV Preeminent

Bar Admissions

Illinois
Admitted: 1983
New Jersey
Admitted: 1986

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