Atty. Stefan Onno Heller

Atty. Stefan Onno Heller

Mr. Stefan Onno Heller is a lawyer practicing environmental and natural resources, tax, litigation.

Portland Portland 15 yrs experience 15 year
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Profile Summary

About Stefan Onno Heller at a glance

Stefan Onno Heller is a tax, litigation, and environmental attorney based in Portland, Oregon. They have 15+ years of legal experience, licensed to practice since 2011. Admitted to practice in Oregon (2011) and California (2014). Educated at Lewis & Clark Law School (JD, 2011). Serands clients in Portland, OR and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mr. Stefan Onno Heller is a lawyer practicing environmental and natural resources, tax, litigation
  • Stefan has been licensed for 15 years
  • Stefan practices in Portland, OR

Practice Areas Explained

Stefan Onno Heller's Areas of Practice

Each practice area below reflects the types of cases Stefan Onno Heller handles, with a brief overview of what that area of law covers.

Tax Law

Tax attorneys handle IRS audits, tax debt, international tax, estate planning, and tax court litigation.

Stefan Onno Heller is one of 85,302 tax attorneys indexed nationally. Browse tax attorneys in Oregon →

Civil Litigation

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

Stefan Onno Heller 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.

Stefan Onno Heller is one of 56,434 environmental attorneys indexed nationally. Browse environmental 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 Stefan Onno Heller

Where is Stefan Onno Heller's law office located?
Stefan Onno Heller's law practice is located in Portland, Oregon. You can contact the office directly through this profile page.
What practice areas does Stefan Onno Heller handle?
Stefan Onno Heller focuses on tax, litigation, environmental. Each practice area listed reflects experience handling cases of that type in Oregon.
How long has Stefan Onno Heller practiced law?
Stefan Onno Heller has 15+ years of legal experience and has been licensed since 2011.
Where did Stefan Onno Heller go to law school?
Stefan Onno Heller earned their education at (JD, 2011).
How can I contact Stefan Onno Heller for a consultation?
You can contact Stefan Onno Heller 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

JD
Lewis & Clark Law School
- 2011

Bar Admissions

Oregon
Admitted: 2011
California
Admitted: 2014

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