Atty. John Louis Leonard

Atty. John Louis Leonard

John Louis Leonard is a lawyer practicing environmental and natural resources, commercial, litigation and 2 other areas of law. John received a B.S. degree from Loyola University in 1968, and has been licensed for 55 years.

Northbrook Northbrook 55 yrs experience 55 year
Call (224) 481-5500 Book Appointment

Profile Summary

About John Louis Leonard at a glance

John Louis Leonard is a Partner based in Northbrook, Illinois, practicing at Teeple Leonard & Erdman Attorneys at Law. They have 55+ years of legal experience, licensed to practice since 1971. Their practice focuses on business, real estate, litigation, and environmental. Admitted to practice in Illinois (1971). Educated at Northwestern University (J.D., 1971) and Loyola University (B.S., 1968). Serands clients in Northbrook, IL and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John Louis Leonard is a lawyer practicing environmental and natural resources, commercial, litigation and 2 other areas of law
  • John received a B.S. degree from Loyola University in 1968, and has been licensed for 55 years
  • John practices at Teeple Leonard & Erdman Attorneys at Law in Northbrook, IL

Practice Areas Explained

John Louis Leonard's Areas of Practice

Each practice area below reflects the types of cases John Louis Leonard 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.

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

Real Estate Law

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

John Louis Leonard is one of 316,149 real estate attorneys indexed nationally. Browse real estate attorneys in Illinois →

Civil Litigation

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

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

Environmental Law

Environmental attorneys for regulatory compliance, contamination, land use, and natural resource law.

John Louis Leonard is one of 56,434 environmental attorneys indexed nationally. Browse environmental 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 Northbrook 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 Northbrook or all attorneys in Illinois.

Frequently Asked

Common questions about John Louis Leonard

Where is John Louis Leonard's law office located?
John Louis Leonard's law practice is located in Northbrook, Illinois. The firm is Teeple Leonard & Erdman Attorneys at Law. You can contact the office directly through this profile page.
What practice areas does John Louis Leonard handle?
John Louis Leonard focuses on business, real estate, litigation, environmental. Each practice area listed reflects experience handling cases of that type in Illinois.
How long has John Louis Leonard practiced law?
John Louis Leonard has 55+ years of legal experience and has been licensed since 1971.
Where did John Louis Leonard go to law school?
John Louis Leonard earned their education at (J.D., 1971); (B.S., 1968).
How can I contact John Louis Leonard for a consultation?
You can contact John Louis Leonard 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.
Northwestern University
- 1971
B.S.
Loyola University
- 1968

Bar Admissions

Illinois
Admitted: 1971

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