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John appears in the 

Top 100 Attorneys Magazine

Mahoney, John.JPG
Mahoney, John-logo.JPG

John P. Mahoney


As a preeminent rated federal employee lawyer, former federal government vice chair, executive, and administrative judge, John P. Mahoney has effectively represented thousands of federal employees and contractors in both security clearance appeals and federal employment law matters. For over 27 years, he has utilized his extensive legal experience to protect, defend, and enhance the federal careers of clients in all 50 states as well as around the world. As a founding and managing partner of The Law Firm of John P. Mahoney, Esq., Attorneys at Law, headquartered in Washington, D.C., John specializes in the practice of federal sector employment, labor, and national security clearance law and continues to uphold the highest possible standards in legal ability and ethics.


Known as the “caring federal employment lawyers,” the majority of the firm’s legal team are former federal employees themselves. Consequently, these top-rated federal employment law (FEL) attorneys not only hold an in-depth understanding of employment law, but they also stand ready to protect and defend the rights and careers of their clients. Whether their federal employee clients are under investigation, facing allegations of misconduct, or need to appeal for security clearance decision, or file an EEO or whistleblower retaliation complaint, all clients are offered the experienced legal counsel and advocacy they deserve.


According to John, it is his team’s professionalism, experience as former federal employees, client advocacy, and in-depth understanding of federal employment law that sets them apart from all other firms. In fact, as a result of their quality legal services and impressive performance record, the attorneys have received numerous awards. Most recently, they were included in the 2020 Bar Registry of Preeminent Lawyers and were named as a Preeminent AV Rated Law Firm by Martindale-AVVO in 2020. They also have received a Superb 10.0 AVVO rating.


The D.C. community recognizes the firm’s recognition by Martindale-AVVO as evidence of John’s “preeminent legal ability, expertise, experience, integrity and overall professional excellence.” Among his many other honors and awards, John was selected as a 2019 Top-Rated Lawyer in Labor & Employment and as a 2020 Top-Rated D.C. Metro Lawyer in Labor & Employment Law by The National Law Journal, Corporate Counsel Magazine, and American Lawyer Magazine. The firm’s attorneys were recently named Top Lawyers of Washington DC, as published in the Baltimore Sun, in recognition for their excellent client service and overall satisfaction. Corporate International named Attorney Mahoney its 2020 Federal Employment Lawyer of the Year in Washington, DC and Global Law Experts awarded The Law Firm of John P. Mahoney, Esq., Attorneys at Law, its Federal Employment Law Lawyers of the Year in Washington, DC for 2020.      


Prior to founding his own law firm, John served as an expert witness on FEL and was appointed to serve as the statutory vice chair and administrate judge (ES-IV) of the U.S. Government Accountability Office’s (GAO) Personnel Appeals Board (PAB). He has also served as general counsel to various unions, as senior associate to the general counsel of the Senior Executives Association (SEA), outside employment or national security law counsel to multiple federal agencies, private federal contractor companies, and other corporations. John also notes that he holds first-hand experience as a federal employee serving as a manager within a federal agency as well as a federal agency administrative judge interpreting federal employment and labor law, which is rare within the industry. Because he can offer such a diverse and unique perspective, John is a frequently published author and a regular public speaker on federal employment and labor law issues.



John P. Mahoney, Esq.

Founding and Managing Partner

The Law Firm of John P. Mahoney, Esq. Attorneys at Law

Ronald Reagan Building and International Trade Center

1300 Pennsylvania Avenue, NW, Suite 700

Washington, D.C. 20004

Initial consultations line: (202) 759-7780


Twitter: ꟾ @AttorneyMahoney


Download the Top 100 Attorneys Magazine
and check out John's feature on page 16.

Download the Top 100 Attorneys Magazine

and check out John's feature on page 41.

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