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About me

For 15 years C. Sei-Hee Arii has successfully litigated criminal, serious traffic (DUI/DWI), and civil cases. In 2013, 2014, and 2015, she received AVVO's Superb 10.0 rating and its Clients' Choice Award. She has been selected for inclusion in the following lists: Maryland and Washington, D.C. Super Lawyers® (2010-2015) (limited to 5% of Maryland and D.C. lawyers); “Top 100 Trial Lawyers in Maryland" (2010- 2015); “Top 100 Criminal Defense Lawyers in Maryland" (2013- 2015); and Washingtonian Magazine's Best Lawyers (2011-2012).



Arii Law Firm offers quality legal services at a reasonable price. 


Photos and videos

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Practice areas


  1. DUI & DWI: 60%
  2. Personal Injury: 20%
  3. Criminal Defense: 20%



Fixed (sometimes), Free consultation (60 minutes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

3 total 

Are you an attorney? Endorse this lawyer

  • Neal J Meiselman

    Seihee is our go-to lawyer for our divorce clients who need criminal defense or personal injury representation. She does an exceptional job: very thorough, responsive to client needs, and sensitive to what's going on in related divorce and custody matters.


    Neal Meiselman Divorce & Separation Attorney
    Relationship: Fellow lawyer in community

  • Eric H Singer

    Sei-Hee is a terrific criminal defense attorney; she has a great ability to assess a case diligently and negotiate the best outcome or try the matter, whatever the case may be. I have enjoyed coordinating closely with her on cases where her clients have been subject to possible adverse immigration consequences as a result of criminal proceedings.


    Eric Singer Immigration Attorney
    Relationship: Worked together on matter

Contact info

Arii Law Firm

401 East Jefferson Street
Suite 208
Rockville, MD, 20850


VAAuthorized to practice law200009/15/2015
DCActive 199907/19/2014
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Top 100 Criminal Lawyers in MarylandNational Trial Lawyers Association2013
Top Lawyers - Stars of the BarWashingtonian Magazine2011
Top 100 Trial Lawyers in Maryland (2010 to Present)The National Trial Lawyers Association2010
Super Lawyer (2010 to Present)Maryland Super Lawyers2010
Super Lawyer (2010 to Present)Washington DC Super Lawyers2010
Committee Chair of the Year Award: Technology CommitteeMontgomery County Bar Association2008
Bar Foundation FellowMontgomery County Bar Association2008
Outstanding Contribution AwardMontgomery County Inn of Court2007
Bar Foundation FellowMaryland State Bar Association2005
Work experience
TitleCompany nameDuration
OwnerArii Law Firm, LLC2011 - Present
PartnerHeeney & Arii, Chartered2006 - 2011
AssociateLaw Office of Thomas L. Heeney, Chartered2004 - 2006
AssociateHeeney, Armstrong, & Heeney2001 - 2004
AssociateLaw Office of Judy Feinberg2000 - 2001
Association namePosition nameDuration
Maryland State Bar AssociationAsian American Bar Committee2011 - Present
Women's Bar Association of MarylandSecretary2010 - 2011
Women's Bar Association of MarylandTreasurer2009 - 2010
Montgomery County Inn of CourtBarrister2007 - 2011
Asian Pacific American Bar Association of MarylandSecretary2007 - 2008
Maryland Criminal Defense Attorneys' AssociationMember2005 - Present
Women's Bar Association of MarylandMember2004 - Present
Maryland State Bar AssociationLeadership Academy Committee2003 - 2011
School nameMajorDegreeGraduated
La Pier & AssociatesNHTSA DWI Detection and Standardized Field Sobriety Testing3 Day Program2013
National College for DUI DefenseMastering Scientific Evidence in DWI/DUI Cases3 Day Program2012
Georgetown University Law CenterIntensive Session in Trial Advocacy Skills10 Day Program2002
American University, Washington College of LawLawJD - Juris Doctor1998
Smith CollegePsychologyBA - Bachelor of Arts1995