Dennis Joseph Brennan, Business Attorney in Naperville, Illinois
Over 39 years of legal practice · focused on Business, Education, and Real Estate
Naperville, IL
Practicing business in Naperville since 1987.
- 39+
- Years practicing
- 1
- Bar admission
Practices in
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Quick answer
Dennis Joseph Brennan is an attorney based in Naperville, IL. The practice focuses on Business, Education, and Real Estate. Dennis has over 39 years of legal experience.
- Based in
- Naperville, IL
- Experience
- over 39 years
- Known for
- Business · Education · Real Estate
- Handles Business, Education, and Real Estate matters from Naperville, IL.
- Over 39 years of practice as a licensed attorney.
About Dennis Joseph Brennan: Dennis Joseph Brennan is an attorney based in Naperville, IL. The practice focuses on Business, Education, and Real Estate. Dennis has over 39 years of legal experience.
Areas of practice
Legal matters Dennis takes on
Dennis concentrates on business, education, and real estate. Each area below outlines the kind of case Dennis handles, typical outcomes to expect, and how the intake process starts.
Business
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Education
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Real Estate
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Business cases in Naperville, Illinois
Dennis takes business matters in Naperville, Illinois. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Dennis agrees to represent you.
Education cases in Naperville, Illinois
Dennis takes education matters in Naperville, Illinois. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Dennis agrees to represent you.
Real Estate cases in Naperville, Illinois
Dennis takes real estate matters in Naperville, Illinois. Typical engagements include intake calls to scope the issue, review of any records or filings you already have, and a written strategy memo before Dennis agrees to represent you.
Biography
Meet Dennis Joseph Brennan — business lawyer in Naperville
Dennis Joseph Brennan is an attorney based in Naperville, IL. The practice focuses on Business, Education, and Real Estate. Dennis has over 39 years of legal experience.
Dennis Joseph Brennan is a lawyer practicing school law, corporate law, real estate. Dennis Joseph received a B.A. degree from St. Xavier University in 1983, and has been licensed for 39 years. Dennis Joseph practices in Naperville, IL.
Working with Dennis on a business matter
Dennis Joseph Brennan is a lawyer practicing school law, corporate law, real estate. Dennis Joseph received a B.A. degree from St. Xavier University in 1983, and has been licensed for 39 years. Dennis Joseph practices in Naperville, IL.
Clients Dennis works with
Dennis reviews new inquiries case-by-case for business, education, and real estate matters in Naperville and the surrounding Illinois area.
Credentials
Education, bar admissions, and languages
The John Marshall Law School
J.D. · 1986
St. Xavier University
B.A. · 1983
Jurisdictions
Dennis's state bar admissions
Illinois
1987 · ACTIVE
Dennis studied at J.D. in The John Marshall Law School and B.A. in St. Xavier University.
Law school and academic background
Dennis completed J.D. in The John Marshall Law School and B.A. in St. Xavier University. Formal legal training is one signal of substantive knowledge — the day-to-day practice Dennis runs in Illinois is where that training gets applied to real client questions.
Locations
Dennis Joseph Brennan's office in Naperville
Dennis's primary office is at 101 North Washington Street, Naperville, IL, 60540. In-person meetings are by appointment; a phone intake usually comes first.
Client feedback
Client reviews of Dennis Joseph Brennan
Dennis has not yet collected verified client reviews on LawyersListed. Reviews here are all from confirmed clients; anonymous ratings are moderated out.
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Schedule your consultationHiring guide
How to hire Dennis Joseph Brennan — what to expect in your first consultation
Working with a new business attorney should feel structured. Here's how the first two conversations with Dennis usually go, from the moment you request a consult to the day representation begins.
Consultation formats and pricing
Dennis charges for the initial consult. That fee is credited toward representation if you retain Dennis's office.
What to bring to your first meeting
Bring any documents you already have — police reports, medical records, filed pleadings, correspondence from an insurer, a copy of the contract at issue. If you're not sure, err on the side of bringing everything; Dennis will tell you what matters and what doesn't.
Questions to ask a business attorney in Naperville, Illinois
A short list to run through before you commit: How many business matters have you handled in the last year? What's your fee structure? Who else in the office will work on this? What's your realistic estimate of timeline and range of outcomes? How do I reach you between meetings?
Fees & payment
Fees, payment methods, and consultation options for Dennis
Dennis discusses fees during intake so the arrangement fits the matter. Contingency, hourly, and flat-fee options are all common in business practice — ask which fits.
Hourly rates, contingency fees, and flat-fee options
Every business matter is priced differently. Simple document review might be a flat fee. Injury litigation is often contingency. Complex commercial disputes usually run hourly with a retainer. Dennis confirms the model in the engagement letter before any work starts.
Payment methods and payment plans
Dennis's office accepts standard payment methods. Ask about payment plans if the retainer is a stretch — many business practices work with clients on structured schedules.
Frequently asked
Frequently asked questions about Dennis Joseph Brennan
How much does it cost to hire Dennis for a business case?
Cost depends on the type of matter, the fee model (contingency, flat, hourly), and how contested the case becomes. Dennis walks through the likely range during the consult so there are no surprises.
Does Dennis offer a free consultation?
Dennis charges for the initial consult; that fee is credited toward representation if you retain Dennis's office. Some business attorneys offer free consults — check Dennis's current terms during booking.
How long do business cases in Illinois typically take?
Simple business matters can wrap in a few weeks; disputed cases can run 6–18 months from intake to resolution, longer if the matter goes to trial. Dennis gives a realistic estimate for your facts at the consult — vague answers here are a red flag.
Can Dennis take my case if I'm outside Naperville?
Dennis is licensed in Illinois. Matters governed by Illinois law are the natural fit. Out-of-state matters are handled case-by-case, sometimes with local co-counsel. Ask during intake — Dennis will tell you if the case is a fit or refer you to someone closer to your court.
What should I bring to my first meeting with Dennis?
Bring every document that touches the dispute: contracts, correspondence, police or medical reports, filed pleadings, invoices, photographs, insurance letters. Also bring a written timeline of what happened, in your own words. Dennis will filter what matters — over-preparing at intake is always cheaper than needing a second meeting.
Is Dennis accepting new business clients right now?
Dennis's intake status shifts week to week. Submit the form; the office will confirm availability or refer the matter out.
Areas served
Business attorneys serving Naperville, Chicago and Springfield in Illinois
Dennis handles business matters throughout Illinois. Each city below is a direct link into the search page for verified business attorneys in that community.
More counsel
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