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C. Sei-Hee Arii

DUI and DWI Attorney at Rockville, MD

5.0   164 reviews
Free consultation Virtual consultation available
Free consultation Virtual consultation available
  • State Years
    Maryland - MD 22 years
    Virginia - VA 23 years
    Dist. of Columbia - DC 25 years
  • Licensed for 22 years
    State MD
    Acquired 2001
    Active No misconduct found
  • Licensed for 23 years
    State VA
    Acquired 2000
    Active No misconduct found
  • Licensed for 25 years
    State DC
    Acquired 1999
    Good Standing No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About C. Sei-Hee

Learn C. Sei-Hee’s areas of practice.


"Sei-Hee Arii: one in a million attorney; once in a lifetime individual"

"Her knowledge, expertise and professionalism saved my life."

My promise to you: I will look after your best interest; treat you like the individual that you are; and I will fight... for you.

I have successfully litigated criminal, serious traffic (DUI/DWI), and civil cases for over 20 years.  From 2013 to 2020, I received AVVO's Superb 10.0 rating and its Clients' Choice Award. I am AV Rated by Martindale-Hubbell, which is the highest level of professional excellence at which a firm can be ranked by its peers, and am a recipient of their "Client Champion-Gold & Platinum" Award (2019-2020). I have been selected for inclusion in the following lists: Maryland and Washington, D.C. Super Lawyers® (2010-2020) (limited to 5% of Maryland and D.C. lawyers); “Top 100 Trial Lawyers in Maryland" (2010- 2020); “Top 100 Criminal Defense Lawyers in Maryland" (2013- 2020); and Washingtonian Magazine's Best Lawyers (2011-2012).

Let me help you. Call or text me at to get started. 


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


Platinum Client Champion
AV Preeminent Peer Review Rating
Client's Choice 2024,2023,2022,2021,2020,2019,2018,2017,2016,2015,2014,2013
Client's Choice
2024 2023 2022 + 9 ...

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Arii Law Firm
401 East Jefferson Street
Suite 208
Rockville, MD, 20850


5.0 / 5.0
  164 customer reviews
5 Star
4 Star
3 Star
2 Star
1 Star
Client's Choice 2024
Client's Choice
Client's Choice is an Avvo award granted to attorneys with a significant number of client reviews over 4 stars in a given year.
Posted by Mupemba | December 16, 2023
This review is from a person who hired this attorney.
| Hired Attorney
The outcome of my case was so favorable it’s almost as if she had scripted it!
The outcome of my case was so favorable it’s almost as if she had scripted it! Attorney Sei-Hee Arii has a 360 degree bird’s eye view of the legal system and the courtroom.I was facing very serious charges with almost certain jail time if convicted. I initially thought of defending myself but my family compelled me to seek council. I reached out to Attorney Arii the day before my 1st trial date (don’t be like me, make contact now) and requested her counsel. She was extremely understanding, honest about the situation and the possible outcomes but above all VERY RESPONSIVE! I immediately knew I was in good hands and could trust her. Best decision I’ve ever made! In court she laid out a multi-point strategy that accounted for every possible scenario the prosecutor or judge could present and sure enough it went as she planned. During court I witnessed someone with an almost identical case as mine (yet with a better driving record) be found guilty and sentenced to jail time, however Miss Arii got ALL of my charges DISMISSED! I went home a free man! I am extremely grateful! Miss Arii’s great reviews are one of the reasons I chose her as counsel and I’m proud to now add my own testimony of how effective, resourceful and dedicated she is as a lawyer. Thank you Attorney Arii!
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  • Free Consultation 60 minutes
Payment methods
Cash, Check, Credit Card


AVVO RATING 10.0 (Superb)

Work Experience

  • Owner
  • Arii Law Firm, LLC
  • 2011 - Present
  • Partner
  • Heeney & Arii, Chartered
  • 2006 - 2011
  • Associate
  • Law Office of Thomas L. Heeney, Chartered
  • 2004 - 2006
  • Associate
  • Heeney, Armstrong, & Heeney
  • 2001 - 2004
  • Associate
  • Law Office of Judy Feinberg
  • 2000 - 2001
View all work experience


  • La Pier & Associates
  • 3 Day Program
  • 2013
  • National College for DUI Defense
  • 3 Day Program
  • 2012
  • Georgetown University Law Center CLE & National Institute for Trial Advocacy
  • 10 Day Program
  • 2002
  • American University, Washington College of Law
  • JD - Juris Doctor
  • 1998
  • Smith College
  • BA - Bachelor of Arts
  • 1995
View all education


  • Maryland State Bar Association
  • Asian American Bar Committee
  • 2011 - Present
  • Maryland Criminal Defense Attorneys' Association
  • Member
  • 2005 - Present
  • Women's Bar Association of Maryland
  • Member
  • 2004 - Present
  • Women's Bar Association of Maryland
  • Secretary
  • 2010 - 2011
  • Women's Bar Association of Maryland
  • Treasurer
  • 2009 - 2010
  • Montgomery County Inn of Court
  • Barrister
  • 2007 - 2011
  • Asian Pacific American Bar Association of Maryland
  • Secretary
  • 2007 - 2008
  • Maryland State Bar Association
  • Leadership Academy Committee
  • 2003 - 2011
View all associations

Languages Spoken

  • English

Honors and Awards

  • Best Attorneys of America
  • Rue Ratings
  • 2019
  • D.C Superlawyers
  • SuperLawyers
  • 2019
  • Superb 10.0 Rating
  • Avvo
  • 2019
  • Client's Choice
  • Avvo
  • 2019
  • Top 100 Criminal Lawyers in Maryland
  • National Trial Lawyers Association
  • 2013
  • Top Lawyers - Stars of the Bar
  • Washingtonian Magazine
  • 2011
  • Top 100 Trial Lawyers in Maryland (2010 to Present)
  • The National Trial Lawyers Association
  • 2010
  • Super Lawyer (2010 to Present)
  • Maryland Super Lawyers
  • 2010
  • Super Lawyer (2010 to Present)
  • Washington DC Super Lawyers
  • 2010
  • Committee Chair of the Year Award: Technology Committee
  • Montgomery County Bar Association
  • 2008
  • Bar Foundation Fellow
  • Montgomery County Bar Association
  • 2008
  • Outstanding Contribution Award
  • Montgomery County Inn of Court
  • 2007
  • Bar Foundation Fellow
  • Maryland State Bar Association
  • 2005
View all awards

Attorney endorsements

Received (5)
Given (4)
Endorse C. Sei-Hee
Criminal defense Attorney | Mar 23
Relationship: Fellow lawyer in community
"I endorse Ms. Arii. She's a smart, energized lawyer. Recommended!"
Criminal defense Attorney | May 07
Relationship: Fellow lawyer in community
"Sei-Hee is a stellar attorney! She obtains great results in the courtroom because of her hard work, thorough preparation, and command of the law."
Criminal defense Attorney | Feb 08
Relationship: Fellow lawyer in community
"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."
Criminal defense Attorney | Feb 11
Relationship: Worked together on matter
"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."
Criminal defense Attorney | Oct 18
Relationship: Fellow lawyer in community
"Sei-Hee is a dedicated, hard working attorney who is extremely knowledgeable in the field of criminal defense. She provides exemplary defense work for those citizens charged with a crime. I highly recommend her."
Medical malpractice
Divorce and separation
Divorce and separation

Avvo Contributions

This attorney hasn't created any legal answers in Q&A or legal guides recently on Avvo.

Rockville DUI and DWI Lawyer C. Sei-Hee Arii
C. Sei-Hee Arii
DUI and DWI Attorney
Rockville, MD
Licensed for 25 years
Free Consultation
Virtual consultation available