Atty. Daniel E O'Leary

Atty. Daniel E O'Leary

Mr. Daniel E O'Leary is a lawyer practicing environmental litigation, environmental & natural resources, government relations & litigation and 3 other areas of law.

Portland Portland 63 yrs experience 63 year
Call (503) 914-2993 Book Appointment

Profile Summary

About Daniel E O'Leary at a glance

Daniel E O'Leary is a Partner based in Portland, Oregon, practicing at Davis Wright Tremaine LLP. They have 63+ years of legal experience, licensed to practice since 1963. Their practice focuses on litigation, environmental, government, and agriculture. Admitted to practice in Oregon (1963). Educated at Lewis & Clark Law School J.D. Environmental and Natural Resources Law Lewis & Clark Law School LL.M. Environmental and Natural Resources Law (—) and Gonzaga University B.A. Business (—). Recognitions include AV Preeminent. Serands clients in Portland, OR and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mr. Daniel E O'Leary is a lawyer practicing environmental litigation, environmental & natural resources, government relations & litigation and 3 other areas of law
  • Daniel received a B.A. degree from Gonzaga University, and has been licensed for 63 years
  • Daniel practices at Davis Wright Tremaine LLP in Portland, OR

Practice Areas Explained

Daniel E O'Leary's Areas of Practice

Each practice area below reflects the types of cases Daniel E O'Leary handles, with a brief overview of what that area of law covers.

Civil Litigation

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

Daniel E O'Leary is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in Oregon →

Environmental Law

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

Daniel E O'Leary is one of 56,434 environmental attorneys indexed nationally. Browse environmental attorneys in Oregon →

Government & Administrative Law

Attorneys for administrative law, agency hearings, government contracts, licensing, and public benefits.

Daniel E O'Leary is one of 132,225 government attorneys indexed nationally. Browse government attorneys in Oregon →

Agricultural Law

Agriculture attorneys for farm operations, ag finance, land use, water rights, and agribusiness.

Daniel E O'Leary is one of 4,793 agriculture attorneys indexed nationally. Browse agriculture attorneys in Oregon →

Jurisdictional Context

Why local counsel matters in Oregon

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

Looking for additional Oregon attorneys? Browse all attorneys in Portland or all attorneys in Oregon.

Frequently Asked

Common questions about Daniel E O'Leary

Where is Daniel E O'Leary's law office located?
Daniel E O'Leary's law practice is located in Portland, Oregon. The firm is Davis Wright Tremaine LLP. You can contact the office directly through this profile page.
What practice areas does Daniel E O'Leary handle?
Daniel E O'Leary focuses on litigation, environmental, government, agriculture. Each practice area listed reflects experience handling cases of that type in Oregon.
How long has Daniel E O'Leary practiced law?
Daniel E O'Leary has 63+ years of legal experience and has been licensed since 1963.
Where did Daniel E O'Leary go to law school?
Daniel E O'Leary earned their education at (—); (—).
How can I contact Daniel E O'Leary for a consultation?
You can contact Daniel E O'Leary 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.
What awards or recognition has Daniel E O'Leary received?
Daniel E O'Leary's notable recognition includes: AV Preeminent.

Education

Lewis & Clark Law School J.D. Environmental and Natural Resources Law Lewis & Clark Law School LL.M. Environmental and Natural Resources Law
- In Progress
Gonzaga University B.A. Business
- In Progress

Awards

AV Preeminent

Bar Admissions

Oregon
Admitted: 1963

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