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.
Environmental / Natural Resources & More Attorney · Serving Portland, OR · 63+ Years Experience
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. Serves clients in Portland, OR and the surrounding metropolitan area.
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About 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
- 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 Legal Practice
Each practice area below reflects the types of cases Daniel E O'Leary handles, with a practical overview of what that area of law involves and how it may apply to your situation in Portland.
Civil Litigation in Portland
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
Daniel E O'Leary is one of 450,751 litigation attorneys indexed nationally. Browse litigation attorneys in Oregon →
Environmental Law in Portland
Environmental attorneys for regulatory compliance, contamination, land use, and natural resource law.
Daniel E O'Leary is one of 55,977 environmental attorneys indexed nationally. Browse environmental attorneys in Oregon →
Government & Administrative Law in Portland
Attorneys for administrative law, agency hearings, government contracts, licensing, and public benefits.
Daniel E O'Leary is one of 131,162 government attorneys indexed nationally. Browse government attorneys in Oregon →
Agricultural Law in Portland
Agriculture attorneys for farm operations, ag finance, land use, water rights, and agribusiness.
Daniel E O'Leary is one of 4,751 agriculture attorneys indexed nationally. Browse agriculture attorneys in Oregon →
Jurisdictional Context
Why Local Counsel Matters in Portland
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 venue, 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.
Portland Courts and Legal Process
Choosing a Portland-based attorney means your counsel already knows the local docketing timelines, preferred filing formats, and how individual judges typically rule on procedural motions — details that only come from practicing in this jurisdiction day after day. That local familiarity can translate to better strategy, faster filings, and fewer costly surprises.
Looking for additional Oregon attorneys? Browse all attorneys in Portland or all attorneys in Oregon.
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Professional Profile
Why Clients in Portland Choose Daniel E O'Leary
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish Daniel E O'Leary's practice in the field of litigation, environmental, government, and agriculture.
Decade-Tested Legal Experience
Daniel E O'Leary brings 63+ years of hands-on legal practice — enough to have navigated the recurring fact patterns, procedural traps, and negotiation dynamics that shape case outcomes.
Broad Practice Area Coverage
Covering litigation, environmental, and government, Daniel E O'Leary can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Portland
A Portland-based practice means Daniel E O'Leary attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
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Daniel E O'Leary's Practice Areas & Specializations
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