Atty. Robert E Mannion, Sr.

Atty. Robert E Mannion, Sr.

Robert E Mannion, Sr. is a lawyer practicing financial institutions, international, regulatory. Robert received a A.B. degree from Georgetown University in 1965, and has been licensed for 57 years.

Washington Washington 57 Years Experience 57 year
Call (443) 909-4791

Profile Summary

About Robert E Mannion, Sr. at a glance

Robert E Mannion, Sr. is a Retired Partner based in Washington, District of Columbia, practicing at Arnold And Porter Llp. They have 57+ years of legal experience, licensed to practice since 1969. Their practice focuses on international. Admitted to practice in District of Columbia (1969) and U.S. Supreme Court (1976). Educated at Columbus School of Law of The Catholic University of America (J.D., 1969) and Georgetown University (A.B., 1965). Recognitions include AV Preeminent. Active member of The District of Columbia Bar American and Federal Bar Associations. Serves clients in Washington, DC and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Robert E Mannion, Sr. is a lawyer practicing financial institutions, international, regulatory
  • Robert received a A.B. degree from Georgetown University in 1965, and has been licensed for 57 years
  • Robert practices at Arnold & Porter LLP in Washington, DC

Practice Areas Explained

Robert E Mannion, Sr.'s Areas of Practice

Each practice area below reflects the types of cases Robert E Mannion, Sr. handles, with a brief overview of what that area of law covers.

International Law

International law attorneys for cross-border transactions, trade, foreign investment, and treaties.

Robert E Mannion, Sr. is one of 36,155 international attorneys indexed nationally. Browse international attorneys in District of Columbia →

Jurisdictional Context

Why local counsel matters in District of Columbia

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

Looking for additional District of Columbia attorneys? Browse all attorneys in Washington or all attorneys in District of Columbia.

Frequently Asked

Common questions about Robert E Mannion, Sr.

Where is Robert E Mannion, Sr.'s law office located?
Robert E Mannion, Sr.'s law practice is located in Washington, District of Columbia. The firm is Arnold And Porter Llp. You can contact the office directly through this profile page.
What practice areas does Robert E Mannion, Sr. handle?
Robert E Mannion, Sr. focuses on international. Each practice area listed reflects experience handling cases of that type in District of Columbia.
How long has Robert E Mannion, Sr. practiced law?
Robert E Mannion, Sr. has 57+ years of legal experience and has been licensed since 1969.
Where did Robert E Mannion, Sr. go to law school?
Robert E Mannion, Sr. earned their education at (J.D., 1969); (A.B., 1965).
How can I contact Robert E Mannion, Sr. for a consultation?
You can contact Robert E Mannion, Sr. 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 Robert E Mannion, Sr. received?
Robert E Mannion, Sr.'s notable recognition includes: AV Preeminent.

Education

J.D.
Columbus School of Law of The Catholic University of America
- 1969
A.B.
Georgetown University
- 1965

Awards

AV Preeminent

Bar Admissions

District of Columbia
Admitted: 1969
U.S. Supreme Court
Admitted: 1976

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