Atty. Sean Patrick McDonnell

Atty. Sean Patrick McDonnell

Sean Patrick McDonnell is a lawyer practicing congressional investigations & crisis management, litigation & dispute resolution, criminal defense and 1 other area of law. Sean received a B.A. degree from University of Missouri in 2005, and has been licensed for 17 years.

Washington Washington 17 yrs experience 17 year
Call (771) 240-4314 Book Appointment

Profile Summary

About Sean Patrick McDonnell at a glance

Sean Patrick McDonnell is an Associate based in Washington, District of Columbia, practforg at Mayer Brown Llp. They haand 17+ years of legal experience, licensed to practice since 2009. Admitted to practice in Illinois (2009), US District Court for the Northern District of Illinois (2012), US District Court for the Eastern District of Wisconsin (2013), and District of Columbia (2014). Educated at Harvard Law School (J.D., 2009) and University of Missouri (B.A., 2005). Serands clients in Washington, DC and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Sean Patrick McDonnell is a lawyer practicing congressional investigations & crisis management, litigation & dispute resolution, criminal defense and 1 other area of law
  • Sean received a B.A. degree from University of Missouri in 2005, and has been licensed for 17 years
  • Sean practices at Mayer Brown LLP in Washington, DC

Jurisdictional Context

Why local counsel matters in District of Columbia

Practforg 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 substantiand 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 andnue, and the substantiand 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 Sean Patrick McDonnell

Where is Sean Patrick McDonnell's law office located?
Sean Patrick McDonnell's law practice is located in Washington, District of Columbia. The firm is Mayer Brown Llp. You can contact the office directly through this profile page.
How long has Sean Patrick McDonnell practiced law?
Sean Patrick McDonnell has 17+ years of legal experience and has been licensed since 2009.
Where did Sean Patrick McDonnell go to law school?
Sean Patrick McDonnell earned their education at (J.D., 2009); (B.A., 2005).
How can I contact Sean Patrick McDonnell for a consultation?
You can contact Sean Patrick McDonnell 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

J.D.
Harvard Law School
- 2009
B.A.
University of Missouri
- 2005

Bar Admissions

Illinois
Admitted: 2009
US District Court for the Northern District of Illinois
Admitted: 2012
US District Court for the Eastern District of Wisconsin
Admitted: 2013
District of Columbia
Admitted: 2014

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