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.
Congressional Investigations & Crisis Management & More Attorney · Serving Washington, DC · 17+ Years Experience
Profile Summary
About Sean Patrick McDonnell at a Glance
Sean Patrick McDonnell is an Associate based in Washington, District of Columbia, practicing at Mayer Brown Llp. They have 17+ years of legal experience, licensed to practice since 2009. Their practice focuses on criminal defense and litigation. 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). Serves clients in Washington, DC and the surrounding metropolitan area.
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About 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
- Sean practices at Mayer Brown LLP in Washington, DC
Practice Areas Explained
Sean Patrick McDonnell's Areas of Legal Practice
Each practice area below reflects the types of cases Sean Patrick McDonnell handles, with a practical overview of what that area of law involves and how it may apply to your situation in Washington.
Criminal Defense in Washington
A criminal defense attorney protects your rights from arrest through trial. Find experienced lawyers handling DUI, drug, federal, theft, and violent-crime charges.
Sean Patrick McDonnell is one of 212,605 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in District of Columbia →
Civil Litigation in Washington
Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.
Sean Patrick McDonnell is one of 450,750 litigation attorneys indexed nationally. Browse litigation attorneys in District of Columbia →
Jurisdictional Context
Why Local Counsel Matters in Washington
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.
Washington Courts and Legal Process
Choosing a Washington-based attorney means your counsel already knows the local docketing timelines, preferred filing formats, and how individual judges typically rule on procedural motions — details that only come from practicing in this jurisdiction day after day. That local familiarity can translate to better strategy, faster filings, and fewer costly surprises.
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Professional Profile
Why Clients in Washington Choose Sean Patrick McDonnell
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish Sean Patrick McDonnell's practice in the field of criminal defense and litigation.
Decade-Tested Legal Experience
Sean Patrick McDonnell brings 17+ years of hands-on legal practice — enough to have navigated the recurring fact patterns, procedural traps, and negotiation dynamics that shape case outcomes.
Multi-State Bar Admission
Licensed in Illinois, US District Court for the Northern District of Illinois, and US District Court for the Eastern District of Wisconsin, Sean Patrick McDonnell can represent clients in cases that span state lines or require counsel in multiple jurisdictions.
Broad Practice Area Coverage
Covering criminal defense and litigation, Sean Patrick McDonnell can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Washington
A Washington-based practice means Sean Patrick McDonnell attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
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Sean Patrick McDonnell's Practice Areas & Specializations
Education & Law School Background
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