Atty. William John Leahy

Atty. William John Leahy

William John Leahy is a lawyer practicing employee benefits, litigation, competition and trade secret law and 2 other areas of law. William received a B.A. degree from Boston College in 1994, and has been licensed for 29 years.

Philadelphia Philadelphia 29 yrs experience 29 year
Call (651) 758-2536 Book Appointment

Profile Summary

About William John Leahy at a glance

William John Leahy is a Shareholder based in Philadelphia, Pennsylvania, practicing at Littler Mendelson P.C.. They have 29+ years of legal experience, licensed to practice since 1997. Their practice focuses on employment, trade secrets, litigation, and civil rights. Admitted to practice in New Jersey (1997), Pennsylvania U.S. District Court, Middle District of Pennsylvania Pennsylvania Supreme Court (1997), New Jersey Supreme Court U.S. District Court, Eastern District of Pennsylvania U.S. Court of Appeals (1997), and Missouri U.S. District Court, District of New Jersey (1998). Educated at Villanova University School of Law (J.D., 1997) and Boston College (B.A. English, 1994). Serands clients in Philadelphia, PA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • William John Leahy is a lawyer practicing employee benefits, litigation, competition and trade secret law and 2 other areas of law
  • William received a B.A. degree from Boston College in 1994, and has been licensed for 29 years
  • William practices at Littler Mendelson P.C. in Philadelphia, PA

Practice Areas Explained

William John Leahy's Areas of Practice

Each practice area below reflects the types of cases William John Leahy handles, with a brief overview of what that area of law covers.

Employment Law

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

William John Leahy is one of 169,120 employment attorneys indexed nationally. Browse employment attorneys in Pennsylvania →

Trade Secrets

William John Leahy is one of 6,644 trade secrets attorneys indexed nationally. Browse trade secrets attorneys in Pennsylvania →

Civil Litigation

Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.

William John Leahy is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in Pennsylvania →

Civil Rights

Civil rights attorneys for discrimination, police misconduct, constitutional rights, and civil liberties cases.

William John Leahy is one of 70,245 civil rights attorneys indexed nationally. Browse civil rights attorneys in Pennsylvania →

Jurisdictional Context

Why local counsel matters in Pennsylvania

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

Looking for additional Pennsylvania attorneys? Browse all attorneys in Philadelphia or all attorneys in Pennsylvania.

Frequently Asked

Common questions about William John Leahy

Where is William John Leahy's law office located?
William John Leahy's law practice is located in Philadelphia, Pennsylvania. The firm is Littler Mendelson P.C.. You can contact the office directly through this profile page.
What practice areas does William John Leahy handle?
William John Leahy focuses on employment, trade secrets, litigation, civil rights. Each practice area listed reflects experience handling cases of that type in Pennsylvania.
How long has William John Leahy practiced law?
William John Leahy has 29+ years of legal experience and has been licensed since 1997.
Where did William John Leahy go to law school?
William John Leahy earned their education at (J.D., 1997); (B.A. English, 1994).
How can I contact William John Leahy for a consultation?
You can contact William John Leahy 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.
Villanova University School of Law
- 1997
B.A. English
Boston College
- 1994

Bar Admissions

New Jersey
Admitted: 1997
Pennsylvania U.S. District Court, Middle District of Pennsylvania Pennsylvania Supreme Court
Admitted: 1997
New Jersey Supreme Court U.S. District Court, Eastern District of Pennsylvania U.S. Court of Appeals
Admitted: 1997
Missouri U.S. District Court, District of New Jersey
Admitted: 1998
Missouri Supreme Court
Admitted: 1998

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