Atty. James G. Grennan

Atty. James G. Grennan

James G. Grennan is a lawyer practicing administrative law, social security, social security disability law and 1 other area of law.

Oklahoma City Oklahoma City 65 yrs experience 65 year
Call (405) 900-8656 Book Appointment

Profile Summary

About James G. Grennan at a glance

James G. Grennan is a Member based in Oklahoma City, Oklahoma, practicing at Jim Grennan. They have 65+ years of legal experience, licensed to practice since 1961. Their practice focuses on trusts, ssd, securities, and government. Admitted to practice in Oklahoma (1961). Educated at University of Tulsa (LL.B., 1961) and University of Tulsa (B.A., 1958). Recognitions include BV Distinguished. Serands clients in Oklahoma City, OK and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • James G. Grennan is a lawyer practicing administrative law, social security, social security disability law and 1 other area of law
  • James received a B.A. degree from University of Tulsa in 1958, and has been licensed for 65 years
  • James practices at Jim Grennan in Oklahoma City, OK

Practice Areas Explained

James G. Grennan's Areas of Practice

Each practice area below reflects the types of cases James G. Grennan handles, with a brief overview of what that area of law covers.

Trusts

James G. Grennan is one of 104,172 trusts attorneys indexed nationally. Browse trusts attorneys in Oklahoma →

Social Security Disability

SSDI and SSI attorneys for disability claims, denied benefits, and Social Security appeals.

James G. Grennan is one of 26,532 ssd attorneys indexed nationally. Browse ssd attorneys in Oklahoma →

Securities Law

James G. Grennan is one of 64,529 securities attorneys indexed nationally. Browse securities attorneys in Oklahoma →

Government & Administrative Law

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

James G. Grennan is one of 132,225 government attorneys indexed nationally. Browse government attorneys in Oklahoma →

Jurisdictional Context

Why local counsel matters in Oklahoma

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

Looking for additional Oklahoma attorneys? Browse all attorneys in Oklahoma City or all attorneys in Oklahoma.

Frequently Asked

Common questions about James G. Grennan

Where is James G. Grennan's law office located?
James G. Grennan's law practice is located in Oklahoma City, Oklahoma. The firm is Jim Grennan. You can contact the office directly through this profile page.
What practice areas does James G. Grennan handle?
James G. Grennan focuses on trusts, ssd, securities, government. Each practice area listed reflects experience handling cases of that type in Oklahoma.
How long has James G. Grennan practiced law?
James G. Grennan has 65+ years of legal experience and has been licensed since 1961.
Where did James G. Grennan go to law school?
James G. Grennan earned their education at (LL.B., 1961); (B.A., 1958).
How can I contact James G. Grennan for a consultation?
You can contact James G. Grennan 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 James G. Grennan received?
James G. Grennan's notable recognition includes: BV Distinguished.

Education

LL.B.
University of Tulsa
- 1961
B.A.
University of Tulsa
- 1958

Awards

BV Distinguished

Bar Admissions

Oklahoma
Admitted: 1961

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