Firm Overview

Established on the basic belief that all clients deserve passionate, experienced and skilled representation, the Mason So Law Firm and attorney Kosa So, have built a foundation of satisfied clients and continue to expand that base. At the Mason So Law Firm, we approach each case as if it is the firm’s only case. Through clear communication with clients, a thorough evaluation of the facts and evidence in the case, and a commitment to excellence, the Mason So Law Firm continues to obtain results and meet client expectations.

Criminal and Traffic Defense attorney Kosa So believes that a strong attorney-client relationship is vital to securing the right result for each case.

With more than two decades of experience defending clients accused of traffic, misdemeanor and felony offenses, Kosa So has the skills and knowledge necessary to handle your case.

Our Location

The Mason So Law Firm is located in Fairfax, Virginia, and represents clients in Fairfax County and all of the surrounding Northern Virginia courts including, but not limited to: Alexandria, Arlington, Falls Church, Fairfax City, Fauquier, Fredericksburg, Haymarket, Herndon, Loudoun, Manassas City, Prince William, Spotsylvania, Stafford, Vienna, Warrenton, and Winchester. Attorney Kosa So also represents clients in Federal Court, specifically the United States District Court for the Eastern District of Virginia located in Alexandria.

We are located across the street from the Fairfax County Courthouse, near the Hard Times Café.

Address: 4101 Chain Bridge Road, Suite 109, Fairfax, VA

Office Hours: 9 am to 5 pm Monday - Friday

Evenings and weekends by special appointment

Phone: (703) 691-2050

We invite you to contact us for a FREE initial consultation regarding your criminal or traffic offense.

About Kosa So

Kosa So is the founder and owner of the Mason So Law Firm. For more than 20 years, he has represented thousands of clients in need of either criminal or civil help. His experience is extensive, and includes many jury trials (both civil and criminal), contractual disagreements, bench trials, and judicial work. He has represented students before the school board and proprietors before the ABC board. He has built his practice on the belief that each client deserves passionate, experienced and effective representation. Each client is treated with respect regardless of the nature of his or her case. He graduated with honors from the Washington College of Law at American University, where he was a Note & Comment editor of the Law Review.

Attorney Kosa So also served as a federal law clerk to the Honorable U.S. Magistrate Judge James E. Bradberry, where he gained invaluable knowledge and wisdom working directly with a federal judge. His experience as a federal law clerk afforded him an insider’s perspective of the day-to-day functioning of a courthouse. In addition to his experience as a law clerk, he worked closely with a distinguished police officer and former Virginia assistant commonwealth attorney (prosecutor) for several years.

He is licensed to practice in all Virginia courts, as well as before the U.S. District Court for the Eastern District of Virginia and the U.S. Court of Appeals for the Fourth Circuit.