Atty. John Alan Leja

Atty. John Alan Leja

John Alan Leja is a lawyer practicing commercial, financial markets and services, complex commercial litigation and 6 other areas of law. John received a B.S. degree from Purdue University in 1991, and has been licensed for 28 years.

Chicago Chicago 28 yrs experience 28 year
Call (224) 801-3908 Book Appointment

Profile Summary

About John Alan Leja at a glance

John Alan Leja is a Shareholder based in Chicago, Illinois, practicing at Polsinelli PC. They have 28+ years of legal experience, licensed to practice since 1998. Their practice focuses on patent, business, ip, class action, and construction. Admitted to practice in Illinois (1998), U.S. Court of Appeals, Seventh Circuit (2003), and U.S. District Court, Northern District of Illinois (2009). Educated at Cornell University (J.D., 1998) and Purdue University (B.S., 1991). Recognitions include Peer Reviewed. Serands clients in Chicago, IL and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John Alan Leja is a lawyer practicing commercial, financial markets and services, complex commercial litigation and 6 other areas of law
  • John received a B.S. degree from Purdue University in 1991, and has been licensed for 28 years
  • John practices at Polsinelli PC in Chicago, IL

Practice Areas Explained

John Alan Leja's Areas of Practice

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

Patent Law

John Alan Leja is one of 20,749 patent attorneys indexed nationally. Browse patent attorneys in Illinois →

Business & Corporate Law

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

John Alan Leja 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.

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

Class Action

John Alan Leja is one of 26,424 class action attorneys indexed nationally. Browse class action attorneys in Illinois →

Construction Law

John Alan Leja is one of 40,689 construction attorneys indexed nationally. Browse construction 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 John Alan Leja

Where is John Alan Leja's law office located?
John Alan Leja's law practice is located in Chicago, Illinois. The firm is Polsinelli PC. You can contact the office directly through this profile page.
What practice areas does John Alan Leja handle?
John Alan Leja focuses on patent, business, ip, class action, construction. Each practice area listed reflects experience handling cases of that type in Illinois.
How long has John Alan Leja practiced law?
John Alan Leja has 28+ years of legal experience and has been licensed since 1998.
Where did John Alan Leja go to law school?
John Alan Leja earned their education at (J.D., 1998); (B.S., 1991).
How can I contact John Alan Leja for a consultation?
You can contact John Alan Leja 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 John Alan Leja received?
John Alan Leja's notable recognition includes: Peer Reviewed.

Education

J.D.
Cornell University
- 1998
B.S.
Purdue University
- 1991

Awards

Peer Reviewed

Bar Admissions

Illinois
Admitted: 1998
U.S. Court of Appeals, Seventh Circuit
Admitted: 2003
U.S. District Court, Northern District of Illinois
Admitted: 2009

Reviews

4.2
7 Review
5 0
4 0
3 0
2 0
1 0
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