Atty. John Detjens III

Atty. John Detjens III

John Detjens III is a lawyer practicing general corporate law, mergers and acquisitions law, corporate finance law. John received a B.A. degree from Princeton University in 1956, and has been licensed for 60 years.

Lake Oswego Lake Oswego 60 yrs experience 60 year
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Profile Summary

About John Detjens III at a glance

John Detjens III is a business and m&a attorney based in Lake Oswego, Oregon. They have 60+ years of legal experience, licensed to practice since 1966. Admitted to practice in Connecticut (1966) and Oregon (1977). Educated at Yale University (LL.B., 1961) and Princeton University (B.A., 1956). Serands clients in Lake Oswego, OR and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John Detjens III is a lawyer practicing general corporate law, mergers and acquisitions law, corporate finance law
  • John received a B.A. degree from Princeton University in 1956, and has been licensed for 60 years
  • John practices in Lake Oswego, OR

Practice Areas Explained

John Detjens III's Areas of Practice

Each practice area below reflects the types of cases John Detjens III handles, with a brief overview of what that area of law covers.

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

John Detjens III is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Oregon →

Mergers & Acquisitions

John Detjens III is one of 49,731 m&a attorneys indexed nationally. Browse m&a 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 Lake Oswego 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 Lake Oswego or all attorneys in Oregon.

Frequently Asked

Common questions about John Detjens III

Where is John Detjens III's law office located?
John Detjens III's law practice is located in Lake Oswego, Oregon. You can contact the office directly through this profile page.
What practice areas does John Detjens III handle?
John Detjens III focuses on business, m&a. Each practice area listed reflects experience handling cases of that type in Oregon.
How long has John Detjens III practiced law?
John Detjens III has 60+ years of legal experience and has been licensed since 1966.
Where did John Detjens III go to law school?
John Detjens III earned their education at (LL.B., 1961); (B.A., 1956).
How can I contact John Detjens III for a consultation?
You can contact John Detjens III 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

LL.B.
Yale University
- 1961
B.A.
Princeton University
- 1956

Bar Admissions

Connecticut
Admitted: 1966
Oregon
Admitted: 1977

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