Welcome to Law Office of Mark R Voss & Associates, P.C.

About Us

Our team

Mark R. Voss
I graduated from Georgetown University School of Law in 1980, and upon graduation, I practiced criminal defense work in Alexandria, Virginia. Shortly thereafter, I became a Commonwealth Attorney in Alexandria.

In 1987, I opened a Law Office in Manassas, Virginia, where, to this day, I continue to practice criminal defense work.

Prior to attending Law School at Georgetown, where I graduated on the Dean’s List, I had studied and received a Ph.L., an M.S., and an M.A. These degrees allowed me to teach in various places including for several years in a University in Argentina in the ‘70’s, where I developed physics and mathematics programs and designed and implemented a practicum/work program for engineering students.

I have served on the board of directors of various corporations and educational institutions here in Northern Virginia.

I am fluent in Spanish and continue to enjoy being able to use Spanish daily in my work as a criminal defense attorney.  Please feel free to email me at markrvoss@gmail.com

Daniel L. Voss
I graduated at the top 5% of my class at George Mason University School of Law in 2005.  Even while in law school, the focus of my studies and interest were on the area of criminal law and procedure. As a member of the George Mason Law Review, my note was on the application of the 'fruit of the poisonous tree' doctrine to police officers' intentional Miranda violations. In my criminal procedure class, I received the only A+ that that professor had ever given in his three years teaching that course. Upon graduation, I worked in the litigation department of one of the ten largest law firms in the world, and I have been practicing primarily in the area of criminal defense throughout Northern Virginia since 2008.

I have daily interactions with the Judges and prosecutors in the counties of Fairfax and Prince William, so I know them and the system very well.

I am fluent in Spanish, having lived in Argentina. I would love to discuss your case with you.

Michaela Voss Long
Mark's daughter, Michaela, serves as Office Manager.

Our history

Located in Manassas, Virginia, our family-built law firm serves the needs of people charged with traffic and criminal crimes.

Mark began his solo-practice in Manassas in 1987, and his son Daniel joined him in 2008.

Our specialities

Practicing Criminal and Traffic Law in Northern Virginia since 1987.

Every case is unique; some require aggressive litigation, while others require mitigation and negotiation.

Contact Us

Drop us a line!

Please call to make a appointment for a free consultation.

We love our clients, so feel free to visit during normal business hours.

Law Office of Mark R Voss & Associates, P.C.

9315 Center Street, Suite 101, Manassas, VA 20110, US

(703) 368-1165 | Fax: (703) 368-5969



9:00 am – 5:00 pm


9:00 am – 5:00 pm


9:00 am – 5:00 pm


9:00 am – 5:00 pm


9:00 am – 5:00 pm