Atty. Mary Ellen Cassidy

Atty. Mary Ellen Cassidy

Mary Ellen Cassidy is a lawyer practicing tax, employee benefits, estate planning and 1 other area of law. Mary received a B.A. degree from State University of New York at Binghamton in 1977, and has been licensed for 39 years.

Washington Washington 39 yrs experience 39 year
Call (202) 984-3174 Book Appointment

Profile Summary

About Mary Ellen Cassidy at a glance

Mary Ellen Cassidy is a Counsel based in Washington, District of Columbia, practicing at Arnold And Porter Llp. They have 39+ years of legal experience, licensed to practice since 1987. Their practice focuses on personal injury, estate planning, employment, and tax. Admitted to practice in New York (1987) and District of Columbia (1988). Educated at George Washington University National Law Center (J.D., 1986) and State University of New York at Binghamton (B.A. State, 1977). Serands clients in Washington, DC and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mary Ellen Cassidy is a lawyer practicing tax, employee benefits, estate planning and 1 other area of law
  • Mary received a B.A. degree from State University of New York at Binghamton in 1977, and has been licensed for 39 years
  • Mary practices at Arnold & Porter LLP in Washington, DC

Practice Areas Explained

Mary Ellen Cassidy's Areas of Practice

Each practice area below reflects the types of cases Mary Ellen Cassidy handles, with a brief overview of what that area of law covers.

Personal Injury

Personal injury attorneys help accident victims recover compensation for medical bills, lost wages, and pain & suffering. Most work on contingency — no fee unless you win.

Mary Ellen Cassidy is one of 264,852 personal injury attorneys indexed nationally. Browse personal injury attorneys in District of Columbia →

Estate Planning & Probate

An estate planning attorney prepares wills, trusts, powers of attorney, and healthcare directives to protect your family and pass on your assets.

Mary Ellen Cassidy is one of 226,536 estate planning attorneys indexed nationally. Browse estate planning attorneys in District of Columbia →

Employment Law

Employment lawyers represent workers in wrongful termination, discrimination, harassment, wage & hour disputes, and severance negotiations.

Mary Ellen Cassidy is one of 169,120 employment attorneys indexed nationally. Browse employment attorneys in District of Columbia →

Tax Law

Tax attorneys handle IRS audits, tax debt, international tax, estate planning, and tax court litigation.

Mary Ellen Cassidy is one of 85,302 tax attorneys indexed nationally. Browse tax 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 Mary Ellen Cassidy

Where is Mary Ellen Cassidy's law office located?
Mary Ellen Cassidy'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 Mary Ellen Cassidy handle?
Mary Ellen Cassidy focuses on personal injury, estate planning, employment, tax. Each practice area listed reflects experience handling cases of that type in District of Columbia.
How long has Mary Ellen Cassidy practiced law?
Mary Ellen Cassidy has 39+ years of legal experience and has been licensed since 1987.
Where did Mary Ellen Cassidy go to law school?
Mary Ellen Cassidy earned their education at (J.D., 1986); (B.A. State, 1977).
How can I contact Mary Ellen Cassidy for a consultation?
You can contact Mary Ellen Cassidy 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.
George Washington University National Law Center
- 1986
B.A. State
State University of New York at Binghamton
- 1977

Bar Admissions

New York
Admitted: 1987
District of Columbia
Admitted: 1988

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