Atty. Dennis Patrick O'Reilly

Atty. Dennis Patrick O'Reilly

Dennis Patrick O'Reilly is a lawyer practicing corporate, private equity, benefit corporations & corporate sustainability. Dennis received a degree from Georgetown University in 2005, and has been licensed for 17 years.

Washington Washington 17 yrs experience 17 year
Call (202) 979-8386 Book Appointment

Profile Summary

About Dennis Patrick O'Reilly at a glance

Dennis Patrick O'Reilly is a business and environmental attorney based in Washington, District of Columbia. They have 17+ years of legal experience, licensed to practice since 2009. Admitted to practice in Pennsylvania (2009), New Jersey (2010), and District of Columbia (2014). Educated at The George Washington University Law School (J.D., 2009) and Georgetown University (B.S.F.S. Georgetown, 2005). Serands clients in Washington, DC and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Dennis Patrick O'Reilly is a lawyer practicing corporate, private equity, benefit corporations & corporate sustainability
  • Dennis received a degree from Georgetown University in 2005, and has been licensed for 17 years
  • Dennis practices in Washington, DC

Practice Areas Explained

Dennis Patrick O'Reilly's Areas of Practice

Each practice area below reflects the types of cases Dennis Patrick O'Reilly handles, with a brief overview of what that area of law covers.

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

Dennis Patrick O'Reilly is one of 501,317 business attorneys indexed nationally. Browse business attorneys in District of Columbia →

Environmental Law

Environmental attorneys for regulatory compliance, contamination, land use, and natural resource law.

Dennis Patrick O'Reilly is one of 56,434 environmental attorneys indexed nationally. Browse environmental 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 andnue, 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 Dennis Patrick O'Reilly

Where is Dennis Patrick O'Reilly's law office located?
Dennis Patrick O'Reilly's law practice is located in Washington, District of Columbia. You can contact the office directly through this profile page.
What practice areas does Dennis Patrick O'Reilly handle?
Dennis Patrick O'Reilly focuses on business, environmental. Each practice area listed reflects experience handling cases of that type in District of Columbia.
How long has Dennis Patrick O'Reilly practiced law?
Dennis Patrick O'Reilly has 17+ years of legal experience and has been licensed since 2009.
Where did Dennis Patrick O'Reilly go to law school?
Dennis Patrick O'Reilly earned their education at (J.D., 2009); (B.S.F.S. Georgetown, 2005).
How can I contact Dennis Patrick O'Reilly for a consultation?
You can contact Dennis Patrick O'Reilly 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.
The George Washington University Law School
- 2009
B.S.F.S. Georgetown
Georgetown University
- 2005

Bar Admissions

Pennsylvania
Admitted: 2009
New Jersey
Admitted: 2010
District of Columbia
Admitted: 2014

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