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headshot of arnie mason, williams mullen partner

Arnie B. Mason

Tysons, VA
  • T.
  • 703.760.5235
  • F.
  • 703.748.0244

Whether you are a general contractor, a subcontractor or a surety, Arnie Mason can help with all phases of a construction project, including contract formation, advice, claims evaluation and preparation and litigation. He is well-versed in all forms of dispute resolution, including dispute review boards (DRBs), mediation and arbitration for clients who prefer to avoid litigation. As a partner in Williams Mullen's Construction Practice, he also prepares and negotiates construction contracts and joint venture agreements and prepares, analyzes and prosecutes or defends complex construction claims.

Arnie's domestic and international projects have included work on:

  • Tunnels.
  • Roads/highways.
  • Light rail systems.
  • Water treatment plants.
  • Hotels.
  • Embassies.

He also advises clients on federal government construction contracts and state and private projects.

Of particular interest to some of our clients who may be facing investigation is Arnie's extensive experience in the review and defense of False Claims Act allegations. He also can advise and assist with issues related to government contracts, small business contracting opportunities, the use of Disadvantaged Business Enterprises on federally-funded projects, and Mentor-Protégé Agreements.

Arnie has been recognized by Chambers USA for Construction Law (2019). He had previously been listed as an "Up-and-Coming" attorney by Chambers USA (2016-2017). He is listed in The Best Lawyers in America® for Construction Law and Litigation – Construction (2018-present); named among Virginia's "Legal Elite" for Construction Law by Virginia Business magazine (2018-present); and listed in Virginia Super Lawyers and Washington D.C. Super Lawyers for Construction Litigation (2019).

Arnie joined Williams Mullen after practicing with Watt, Tieder, Hoffar & Fitzgerald for 11 years. Prior to that, Arnie held a judicial clerkship with the Honorable Stephen C. St. John of the United States Bankruptcy Court for the Eastern District of Virginia. He served two three-year terms as a member of the board of governors for the Construction Law & Public Contracts Section of the Virginia State Bar.

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  • College of William & Mary School of Law (J.D.), 2000
    • Kenneth G. Cumming Scholarship
    • William & Mary Law Review, Managing Editor 
  • University of Virginia (B.A.), 1997
Professional & Community Affiliations

Professional Affiliations

  • Virginia State Bar – Board of Governors, Construction Law & Public Contracts Section (2014-2020)
  • American Bar Association
Bar & Court Admissions

Bar Admissions

  • District of Columbia Bar
  • Maryland State Bar
  • Virginia State Bar

Court Admissions

  • Court of Appeals for Maryland and all lower courts
  • District of Columbia Court of Appeals
  • Supreme Court of Virginia
  • U.S. Bankruptcy Court for the Eastern District of Virginia
  • U.S. Court of Appeals for the Federal Circuit
  • U.S. Court of Appeals for the Fourth Circuit
  • U.S. Court of Federal Claims
  • U.S. District Court, District of Columbia
  • U.S. District Court, District of Maryland
  • U.S. District Court, Eastern District of Virginia
  • U.S. District Court, Western District of Virginia

Arlington Magazine’s Top Attorneys - Government Contracts (2019)

The Best Lawyers in America® for Construction Law and Litigation – Construction (2018-present)

Named the Best Lawyers® Washington, D.C. "Lawyer of the Year" for Litigation - Construction (2022)

Virginia Business - "Legal Elite," Construction (2018-present)

Virginia Super Lawyers - Construction Litigation (2019-present)

Chambers USA – Construction (2019-present)

Recognized by Chambers USA as an "Up-and-Coming" Construction Attorney (2016-2017)

Listed in Washington D.C. Super Lawyers magazine (2020-present)

“Arnie Mason does a good job working collaboratively with opposing counsel. He's straightforward.”

Williams Mullen Client Feedback - Chambers USA, 2023