Dennis Sean O'Brien, ADR Attorney in Springfield, Illinois
Over 48 years of legal practice · focused on ADR, Appellate, and Insurance · 4.2/5 rating from 3 verified client reviews
Arbitrator
Springfield, IL
Practicing adr in Springfield since 1978.
- 48+
- Years practicing
- 4.2 ★
- 3 client reviews
- 1
- Bar admission
Practices in
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Quick answer
Dennis Sean O'Brien is an arbitrator based in Springfield, IL. The practice focuses on ADR, Appellate, and Insurance. Dennis has over 48 years of legal experience. Rated 4.2 out of 5 from 3 client reviews.
- Based in
- Springfield, IL
- Experience
- over 48 years
- Known for
- ADR · Appellate · Insurance
- Handles ADR, Appellate, and Insurance matters from Springfield, IL.
- Over 48 years of practice as a licensed attorney.
- Recognized with BV Distinguished.
About Dennis Sean O'Brien: Dennis Sean O'Brien is an arbitrator based in Springfield, IL. The practice focuses on ADR, Appellate, and Insurance. Dennis has over 48 years of legal experience. Rated 4.2 out of 5 from 3 client reviews.
Areas of practice
Dennis's practice areas in Springfield
Dennis concentrates on adr, appellate, insurance, and workers comp. Each area below outlines the kind of case Dennis handles, typical outcomes to expect, and how the intake process starts.
ADR
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Appellate
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Insurance
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Workers Comp
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ADR cases in Springfield, Illinois
Dennis takes adr matters in Springfield, 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.
Appellate cases in Springfield, Illinois
Dennis takes appellate matters in Springfield, 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.
Insurance cases in Springfield, Illinois
Dennis takes insurance matters in Springfield, 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.
Workers Comp cases in Springfield, Illinois
Dennis takes workers comp matters in Springfield, 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
Dennis Sean O'Brien, adr attorney serving Springfield
Dennis Sean O'Brien is an arbitrator based in Springfield, IL. The practice focuses on ADR, Appellate, and Insurance. Dennis has over 48 years of legal experience. Rated 4.2 out of 5 from 3 client reviews. Dennis works from Springfield, Illinois and takes on adr matters across the region.
Dennis Sean O'Brien is a lawyer practicing arbitrator, illinois workers' compensation commission, insurance civil defense and 1 other area of law. Dennis received a B.A. degree from Dominican University in 1975, and has been licensed for 48 years. Dennis practices in Springfield, IL.
How Dennis handles adr matters
Dennis Sean O'Brien is a lawyer practicing arbitrator, illinois workers' compensation commission, insurance civil defense and 1 other area of law. Dennis received a B.A. degree from Dominican University in 1975, and has been licensed for 48 years. Dennis practices in Springfield, IL.
The kind of cases Dennis takes
Dennis reviews new inquiries case-by-case for adr, appellate, and insurance matters in Springfield and the surrounding Illinois area.
Credentials
Credentials — where Dennis studied and practices
Loyola University of Chicago
J.D. · 1978
Dominican University
B.A. Springfield · 1975
Jurisdictions
Dennis's state bar admissions
Illinois
1978 · ACTIVE
Dennis studied at J.D. in Loyola University of Chicago and B.A. Springfield in Dominican University.
Law school and academic background
Dennis completed J.D. in Loyola University of Chicago and B.A. Springfield in Dominican 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.
Recognition
Dennis's legal honors and published work
Dennis has received 1 formal recognition from bar associations, industry bodies, and peer-review services.
BV Distinguished
Legal awards and honors
BV Distinguished.
Affiliations
Dennis's professional memberships and bar associations
Sangamon County, Illinois State and American Bar Associations
membership
Locations
Dennis Sean O'Brien's office in Springfield
Dennis's primary office is at 400 S. Ninth Street, Springfield, IL, 62701. In-person meetings are by appointment; a phone intake usually comes first.
Client feedback
Client reviews of Dennis Sean O'Brien — 4.2/5 rating from 3 verified client reviews
Every review below is from a verified client of Dennis. Reviews cover communication, case outcome, and value — the three signals that matter most when comparing adr attorneys in Springfield.
4.2
3 client reviews
Client ratings are sourced from public records and editorial research. Reviews on LawyersListed are accepted from verified clients once Dennis Sean O'Brien claims this profile.
Read all reviewsHiring guide
How to hire Dennis Sean O'Brien — what to expect in your first consultation
Working with a new adr 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 adr attorney in Springfield, Illinois
A short list to run through before you commit: How many adr 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 adr practice — ask which fits.
Hourly rates, contingency fees, and flat-fee options
Every adr 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 adr practices work with clients on structured schedules.
Frequently asked
Frequently asked questions about Dennis Sean O'Brien
How much does it cost to hire Dennis for a adr 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 adr attorneys offer free consults — check Dennis's current terms during booking.
How long do adr cases in Illinois typically take?
Simple adr 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 Springfield?
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 adr 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
ADR attorneys serving Springfield, Chicago and Northbrook in Illinois
Dennis handles adr matters throughout Illinois. Each city below is a direct link into the search page for verified adr attorneys in that community.
More counsel
Other top-rated adr attorneys in Illinois
If Dennis's intake is full or the fit isn't right, these adr attorneys in Springfield handle similar matters. Every profile below is verified and open to consultations.





