William J. Leahy assists employers with all issues that arise out of the employer-employee relationship, including those involving discrimination and harassment. He has successfully handled employment-related disputes through trial and appeal, including extensive litigation in federal and state courts with claims arising under:

  • Title VII
  • The Americans with Disabilities Act
  • The Family and Medical Leave Act
  • The Uniform Trade Secrets Act
  • The New Jersey Conscientious Employee Protection Act
  • The Age Discrimination in Employment Act

In Will’s trial practice he has obtained successful results for his clients, including:

  • A defense verdict in a jury trial involving claims for defamation and retaliation under the New Jersey Law Against Discrimination
  • An award for the employer in an arbitration of a senior executive’s claim for whistleblower retaliation
  • A defense verdict in a jury trial involving claims for retaliation under the Family and Medical Leave Act and Pennsylvania common law
  • A defense verdict in a jury trial involving a claim for discrimination under the Age Discrimination in Employment Act
  • A defense verdict in a jury trial involving retaliation claim under the Fair Labor Standards Act

Will also represents companies, often in the insurance, pharmaceutical, medical device, staffing, and professional services industries, in matters relating to the protection of trade secrets and confidential information and the enforcement of covenants not to compete. Will’s unfair competition practice includes strategic advice to employers as well as litigation prosecuting and defending against restrictive covenant and trade secrets matters.

In addition to litigation, Will devotes a substantial portion of his practice to advising employers on day-to-day compliance with federal, state and local laws, as well as protection of confidential information. This includes:

  • Drafting and reviewing policies
  • Preparing executive employment agreements
  • Guiding employers through reductions in force
  • Providing advice on harassment, accommodation, and employee leave issues

He frequently presents seminars on these and other topics.

Office managing shareholder of Littler's Philadelphia office, Will previously served on the firm's Associates Committee and is a member of the firm's Unfair Competition and Trade Secrets Practice Group.

Will began his career as a law clerk for the Honorable Robert F. Kelly of the United States District Court for the Eastern District of Pennsylvania.

Affiliazioni professionali e istituzionali


Union League of Philadelphia


Named, The Best Lawyers in America®


Speaking Engagements

COVID Vaccination from Incentives to Mandates

October 27, 2021

Protecting Innovations and Strengthening Human Capital in a World of Employee and Corporate Data Mobility

February 8, 2021

We’re (Almost) Open: Obligations Employers Will Need to Consider as Businesses Prepare to Resume

May 27, 2020

Between a Rock and a Hard Shelter-in-Place | Challenges Employers Will Face When Returning to Work

May 12, 2020

Can I Terminate: Considerations and Implications for Employers

Philadelphia, PA

June 25, 2019

Managing Leaves of Absence: The Interplay of the FMLA and ADA

Philadelphia, PA

June 2, 2015

Preparing The Groundwork To Enforce Non-competes

Philadelphia, PA

September 13, 2012

The Employee from Hell

Philadelphia, PA

November 15, 2011

Adapting to Change: New Developments in the Protection of Trade Secrets and Business Goodwill

June 24, 2010

Sex Offenders, Terrorists and Video Resumes: How Far Can You Go to Get Information on Prospective and Current Employees

February 10, 2010


  • J.D., Villanova University School of Law, 1997
  • B.A., Boston College, 1994

Foro di appartenenza

New Jersey


  • U.S. Court of Appeals, 3rd Circuit
  • Pennsylvania Supreme Court
  • New Jersey Supreme Court
  • Missouri Supreme Court
  • U.S. District Court, Eastern District of Pennsylvania
  • U.S. District Court, Middle District of Pennsylvania
  • U.S. District Court, District of New Jersey