Atty. John Dero Thelan

Atty. John Dero Thelan

John Dero Thelan is a lawyer. John received a A.S. degree from Elgin Community College in 1968, and has been licensed for 52 years.

Mercer Island Mercer Island 52 yrs experience 52 year
Call (206) 506-0473 Book Appointment

Profile Summary

About John Dero Thelan at a glance

John Dero Thelan is an attorney based in Mercer Island, Washington. They have 52+ years of legal experience, licensed to practice since 1974. Admitted to practice in California (1974). Educated at University of San Diego (J.D., 1974) and Elgin Community College (A.S. University, 1968). Recognitions include AV Preeminent. Serands clients in Mercer Island, WA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • John Dero Thelan is a lawyer
  • John received a A.S. degree from Elgin Community College in 1968, and has been licensed for 52 years
  • John practices in Mercer Island, WA

Jurisdictional Context

Why local counsel matters in Washington

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

Looking for additional Washington attorneys? Browse all attorneys in Mercer Island or all attorneys in Washington.

Frequently Asked

Common questions about John Dero Thelan

Where is John Dero Thelan's law office located?
John Dero Thelan's law practice is located in Mercer Island, Washington. You can contact the office directly through this profile page.
How long has John Dero Thelan practiced law?
John Dero Thelan has 52+ years of legal experience and has been licensed since 1974.
Where did John Dero Thelan go to law school?
John Dero Thelan earned their education at (J.D., 1974); (A.S. University, 1968).
How can I contact John Dero Thelan for a consultation?
You can contact John Dero Thelan 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 John Dero Thelan received?
John Dero Thelan's notable recognition includes: AV Preeminent.

Education

J.D.
University of San Diego
- 1974
A.S. University
Elgin Community College
- 1968

Awards

AV Preeminent

Bar Admissions

California
Admitted: 1974

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