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Jonathan Simms

About me

Attorney Jonathan A. Simms is the managing partner of The Simms Firm, PLC. He was recently named as one of the top criminal defense attorneys by The National Trial Lawyers and The American Society of Legal Advocates. Attorney Simms began his legal career as a prosecutor with the District Attorney’s Office in Philadelphia, Pennsylvania. As a prosecutor in one of the nation’s most dangerous and violent cities he worked on cases involving narcotics, firearms, attempted murder, sexual assault, white collar crimes, and D.U.I. As a prosecutor, Attorney Simms quickly gained the respect of his colleagues and judges. He is known for being extremely prepared, professional, and tenacious. While a prosecutor, Attorney Simms worked in the Major Trials unit.


Following his departure from the Philadelphia District Attorney’s office, Attorney Simms was recruited by the Office of the Attorney General for the District of Columbia and brought his skills to the Washington D.C. Metropolitan area. After many years as a prosecutor in Philadelphia and Washington D.C., Attorney Simms began working as a criminal defense attorney. He quickly established a reputation for being an effective and successful defense attorney. He has been commended for his tenacious cross examination of witnesses and ability to effectively communicate to members of a jury. Attorney Simms has worked on several large scale state and federal narcotic cases. Attorney Simms has also successfully defended clients in some of the largest white collar criminal investigations in the Northern Virginia and Washington D.C.

Metropolitan area.


Attorney Simms has tried in excess of over 500 criminal trials as a prosecutor and criminal defense attorney. He is a active member with several area bar associations and community based organizations. Attorney Simms is an experienced trial attorney and will provide you with the superior legal services that you and your family deserve.


Languages spoken: Spanish

Practice areas


  1. Criminal Defense: 100%
    12 years



Fixed (always)

Payment types:

Cash, Check, Credit card

Attorney endorsements

13 total 

Are you an attorney? Endorse this lawyer

  • Matthew Frank Altamura

    I endorse this lawyer. Jonathan's reputation for excellence is well-deserved. He is a highly knowledgeable attorney and very committed to his clients.


    Matthew Altamura Personal injury Attorney
    Relationship: Fellow lawyer in community

  • Mohamed E Seifeldein

    I endorse this lawyer.


    Mohamed Seifeldein Personal injury Attorney
    Relationship: Fellow lawyer in community

Contact info

The Simms Firm, PLC

10560 Main Street
Suite 510
Fairfax, VA, 22030


DCActive 200807/06/2016
VAAuthorized to practice law200711/29/2012
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Top 40 Under 40National Trial Lawyers2014
Top 40 Lawyers Under 40American Society of Legal Advocates2014
Top 100 Trial LawyersNational Trial Lawyers2014
Top LawyersNorthern Virginia Magazine2014
Award of ExcellencePhiladelphia District Attorney's Office2006
Work experience
TitleCompany nameDuration
Managing PartnerThe Simms Firm, PLC2011 - Present
AttorneyBose Law Firm2010 - 2011
AssociateRich Rosenthal Brincefield Manitta Dzubin & Kroeger, LLP2008 - 2010
Trial AttorneyOffice Of The Attorney General, District Of Columbia2007 - 2008
Trial AttorneyPhiladelphia District Attorney's Office2004 - 2007
Association namePosition nameDuration
Virginia Trial Lawyers Association, Criminal Law SectionN/A2014 - Present
Virginia Trial Lawyers AssociationN/A2014 - Present
American Society of Legal AdvocatesN/A2013 - Present
National Trial Lawyers AssociationN/A2013 - Present
Old Dominion Bar AssociationN/A2013 - Present
Northern Virginia Black Attorneys AssociationN/A2008 - Present
U.S. Court of Appeals for the Fourth CircuitN/AN/A
U.S. District Court for the Eastern District of VirginiaN/AN/A
Alexandria Bar AssociationN/AN/A
Virginia State BarN/AN/A
School nameMajorDegreeGraduated
Howard University School of LawLawJD - Juris Doctor2004
Radford UniversityPolitical ScienceBS - Bachelor of Science2001
Syracuse University College of LawLawN/AN/A
Speaking engagements
Conference nameTitleDate
Private Practice SeminarCriminal Law2014
Criminal Law RoundtableCriminal LawN/A