Atty. John C. Hennessy

Atty. John C. Hennessy

John C. Hennessy is a lawyer practicing estate planning, estate administration, business law and 3 other areas of law.

Naperville Naperville 40 yrs experience 40 year
Call (224) 801-5966 Book Appointment

Profile Summary

About John C. Hennessy at a glance

John C. Hennessy is a probate, estate planning, business, real estate, and litigation attorney based in Naperville, Illinois. They have 40+ years of legal experience, licensed to practice since 1986. Admitted to practice in Illinois (1986). Educated at DePaul University (J.D. Taxation, 1986) and University of Notre Dame (B.B.A., 1983). Serands clients in Naperville, IL and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John C. Hennessy is a lawyer practicing estate planning, estate administration, business law and 3 other areas of law
  • John received a B.B.A. degree from University of Notre Dame in 1983, and has been licensed for 40 years
  • John practices in Naperville, IL

Practice Areas Explained

John C. Hennessy's Areas of Practice

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

Probate

John C. Hennessy is one of 128,014 probate attorneys indexed nationally. Browse probate attorneys in Illinois →

Estate Planning & Probate

An estate planning attorney prepares wills, trusts, powers of attorney, and healthcare directives to protect your family and pass on your assets.

John C. Hennessy is one of 226,537 estate planning attorneys indexed nationally. Browse estate planning attorneys in Illinois →

Business & Corporate Law

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

John C. Hennessy 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 C. Hennessy 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 C. Hennessy is one of 454,532 litigation attorneys indexed nationally. Browse litigation 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 Naperville 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 Naperville or all attorneys in Illinois.

Frequently Asked

Common questions about John C. Hennessy

Where is John C. Hennessy's law office located?
John C. Hennessy's law practice is located in Naperville, Illinois. You can contact the office directly through this profile page.
What practice areas does John C. Hennessy handle?
John C. Hennessy focuses on probate, estate planning, business, real estate, litigation. Each practice area listed reflects experience handling cases of that type in Illinois.
How long has John C. Hennessy practiced law?
John C. Hennessy has 40+ years of legal experience and has been licensed since 1986.
Where did John C. Hennessy go to law school?
John C. Hennessy earned their education at (J.D. Taxation, 1986); (B.B.A., 1983).
How can I contact John C. Hennessy for a consultation?
You can contact John C. Hennessy 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. Taxation
DePaul University
- 1986
B.B.A.
University of Notre Dame
- 1983

Bar Admissions

Illinois
Admitted: 1986

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