About the Firm
Sean P. Quinlan — Pennsylvania DUI Defense Attorney
Sean P. Quinlan is the founder of Quinlan Law Group and has practiced in Pennsylvania since 2001. Read his full attorney profile, background, and case work.
Sean P. Quinlan is the founder of Quinlan Law Group and has practiced in Pennsylvania since 2001.
He completed his undergraduate education at Bloomsburg University and earned his J.D., Widener University School of Law. He is a member of the National College for DUI Defense (NCDD).
He defends DUI charges in Cumberland, Dauphin, York, Perry and Adams Counties, Pennsylvania.
- Experience
- Since 2001
- DUI Affiliation
- NCDD Member
- Justia Rating
- 10.0
- BBB Rating
- A+
Where Attorney Quinlan Practices
Pennsylvania DUI defense across Central PA.
Sean P. Quinlan represents DUI clients in the courts where he appears week after week. Choose the page closest to where you were arrested:
DUI defense by county
See all areas we serve across Pennsylvania.
Professional Memberships & Credentials
Where Attorney Quinlan is credentialed.
Active membership in state, county, and national legal organizations — verifiable through each organization's public directory.
Member, National College for DUI Defense (NCDD)
The premier national organization devoted to DUI defense.
Verify →Pennsylvania Bar Association
Statewide professional association of Pennsylvania attorneys.
Verify →Cumberland County Bar Association
Local bar serving Camp Hill, Carlisle, Mechanicsburg, and Shippensburg.
Verify →Dauphin County Bar Association
Local bar covering Harrisburg, Hershey, and Middletown courts.
Verify →Justia Lawyer Directory
10.0 Justia rating — verified attorney profile.
Verify →Lawyer.com
National attorney directory and client-matching platform.
Verify →
Editorial & Review Standards
How the legal information on this site is written.
This site publishes practical explanations of Pennsylvania DUI, criminal, and traffic law. Those explanations affect real decisions, so we hold them to a stated standard.
- Every rule is tied to a statute
- Penalties, deadlines, and eligibility rules cite the controlling Pennsylvania authority — Title 75 (Vehicle Code), Title 18 (Crimes Code), or the Rules of Criminal Procedure — so you can verify the source yourself rather than take our word for it.
- Attorney written or attorney reviewed
- Attorney Sean P. Quinlan reviews substantive legal content before it publishes. Pages carry a visible last-reviewed date, and drafts stay unpublished until that review is complete.
- Updated when the law changes
- Pennsylvania DUI law moves. When the legislature amends a statute — such as Act 58 of 2025 adding 75 Pa.C.S. § 3802(h) — the affected pages are revised and re-dated rather than left in place.
- No outcome promises
- We do not publish guarantees, predicted results, or verdict claims. Client reviews are reproduced from Google as their authors wrote them, and prior results never guarantee a similar outcome.
- Corrections
- If something here is wrong or out of date, email sean@pennsylvaniadui.attorney or call (717) 724-7503. Substantive corrections are made and the page's review date is updated.
- Not legal advice
- This site is general legal information about Pennsylvania law, not advice about your case, and reading it does not create an attorney-client relationship. For advice on your facts, speak with an attorney.
About the Firm
Questions about Attorney Quinlan.
Sean P. Quinlan is the founder of Quinlan Law Group and has practiced in Pennsylvania since 2001. He completed his undergraduate education at Bloomsburg University and earned his J.D., Widener University School of Law. He is a member of the National College for DUI Defense (NCDD). He defends DUI charges in Cumberland, Dauphin, York, Perry and Adams Counties, Pennsylvania.
The firm focuses on Pennsylvania DUI defense, criminal defense (misdemeanor and felony), and traffic citations including CDL cases. For Chapter 7 and Chapter 13 bankruptcy, foreclosure and wage garnishment, visit our bankruptcy practice site at pennsylvaniabankruptcy.attorney.
The firm serves clients throughout Central Pennsylvania: Adams, Cumberland, Dauphin, Franklin, Lancaster, Perry, and York counties, with appearances in magisterial district, common pleas, and PennDOT hearings.
Yes. Every client speaks directly with Attorney Quinlan from intake through resolution. Cases are not handed off to paralegals or junior associates — the attorney you hire is the attorney who appears in court.
Call (717) 724-7503 or schedule online. Initial consultations are free and confidential. Most clients are seen within a few business days; urgent cases (recent arrests, upcoming hearings) are prioritized.
Free consultation · Calls answered now
The sooner we talk, the more we can do.
Every hour matters in a DUI or criminal case. Call directly and speak with Attorney Quinlan — not an intake desk.