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Atty. William Thomas O'Neil

Atty. William Thomas O'Neil

Mr. William Thomas O'Neil is a lawyer practicing health care, employment & labor, erisa and 3 other areas of law.

Washington Washington 36 yrs experience 36 year
Call (202) 367-9055 Book Appointment

Profile Summary

About William Thomas O'Neil at a glance

William Thomas O'Neil is a Member based in Washington, District of Columbia, practicing at The O'Neil Group. They have 36+ years of legal experience, licensed to practice since 1990. Their practice focuses on employment, litigation, environmental, health care, and insurance. Admitted to practice in District of Columbia (1990) and Maryland (2004). Educated at Duke University School of Law (J.D., 1990) and University of Notre Dame (B.A., 1985). Active member of The District of Columbia Bar. Serands clients in Washington, DC and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mr. William Thomas O'Neil is a lawyer practicing health care, employment & labor, erisa and 3 other areas of law
  • William received a B.A. degree from University of Notre Dame in 1985, and has been licensed for 36 years
  • William practices at The O'Neil Group in Washington, DC

Practice Areas Explained

William Thomas O'Neil's Areas of Practice

Each practice area below reflects the types of cases William Thomas O'Neil handles, with a brief overview of what that area of law covers.

Employment Law

Employment lawyers represent workers in wrongful termination, discrimination, harassment, wage & hour disputes, and severance negotiations.

William Thomas O'Neil is one of 169,120 employment attorneys indexed nationally. Browse employment attorneys in District of Columbia →

Civil Litigation

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

William Thomas O'Neil is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in District of Columbia →

Environmental Law

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

William Thomas O'Neil is one of 56,434 environmental attorneys indexed nationally. Browse environmental attorneys in District of Columbia →

Health Care Law

Health care attorneys for HIPAA, Medicare, Medicaid, regulatory compliance, and medical licensing matters.

William Thomas O'Neil is one of 66,735 health care attorneys indexed nationally. Browse health care attorneys in District of Columbia →

Insurance Law

Insurance attorneys for coverage disputes, bad faith claims, denied claims, and policy disputes.

William Thomas O'Neil is one of 121,912 insurance attorneys indexed nationally. Browse insurance attorneys in District of Columbia →

Jurisdictional Context

Why local counsel matters in District of Columbia

Practicing law in District of Columbia. Legal matters in District of Columbia are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Washington are typically filed in the local municipal court or the appropriate District of Columbia state district court, depending on subject matter and amount in controversy. An attorney licensed in District of Columbia 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 District of Columbia courts without local counsel or pro hac vice admission.

Looking for additional District of Columbia attorneys? Browse all attorneys in Washington or all attorneys in District of Columbia.

Frequently Asked

Common questions about William Thomas O'Neil

Where is William Thomas O'Neil's law office located?
William Thomas O'Neil's law practice is located in Washington, District of Columbia. The firm is The O'Neil Group. You can contact the office directly through this profile page.
What practice areas does William Thomas O'Neil handle?
William Thomas O'Neil focuses on employment, litigation, environmental, health care, insurance. Each practice area listed reflects experience handling cases of that type in District of Columbia.
How long has William Thomas O'Neil practiced law?
William Thomas O'Neil has 36+ years of legal experience and has been licensed since 1990.
Where did William Thomas O'Neil go to law school?
William Thomas O'Neil earned their education at (J.D., 1990); (B.A., 1985).
How can I contact William Thomas O'Neil for a consultation?
You can contact William Thomas O'Neil 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.
Duke University School of Law
- 1990
B.A.
University of Notre Dame
- 1985

Bar Admissions

District of Columbia
Admitted: 1990
Maryland
Admitted: 2004

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