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Donald Matthew Knepper

Donald Matthew Knepper

also known as Donny, Donnie

Practice areas:

Criminal Defense, Family, DUI & DWI, Personal Injury, Trusts

About Me

Donny Knepper is an experienced trial attorney practicing law out of Rockville, MD. He has been licensed and practicing in Maryland since 2006. He is also licensed in New Hampshire, Massachusetts and Washington, DC as well as the Federal District Courts for Maryland and New Hampshire.

Over the course of Mr. Knepper’s career he has had a proven track record of success having handled over 1000 cases. He has enjoyed significant victories and has a high rate of success in front of a jury and at trial.  

Former United States Marine

Donny Knepper graduated from the University of Richmond, School of Law in 2006, earning Cum Laude.  Mr. Knepper is a former United States Marine having served on the Presidential Helicopter Squadron earning a Yankee White Top Secret Security Clearance.  Mr. Knepper earned his undergraduate degree from Pennsylvania State University.


Photos and Videos

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Practice Areas

Licensed since 2006

  1. DUI & DWI: 30%
    8 years, 292 cases
  2. Family: 30%
    8 years, 53 cases
  3. Criminal Defense: 30%
    8 years, 326 cases
  4. Trusts: 5%
    2 years, 2 cases
  5. Personal Injury: 5%
    8 years, 15 cases



Free Consultation (60 minutes)

Payment Types:

Cash, Check, Credit Card

Attorney Endorsements

8 total 

  • Christina Marie Hughes

    I endorse this lawyer. I have known Mr. Knepper for years and have had the opportunity to try multiple cases with him. He is a formidable opponent. He is knowledgeable on the law and is an effective litigator, which can be a rare combination. I would not hesitate to recommend his services.


    Christina Hughes Family Attorney
    Relationship: Fellow lawyer in community

  • Joshua Samuel Berman

    Mr. Knepper is an exceptionally zealous advocate for his clients. I am always impressed how much he will go the extra mile to effectively represent his client.


    Joshua Berman Car Accidents Attorney
    Relationship: Fellow lawyer in community

Contact Info

The Law Offices of Donny Knepper

100 South Washington St.
Rockville, MD, 20850



DCActive 201405/24/2015

Professional Misconduct

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

Avvo Contributions

Legal Answers


Award NameGrantorDate Granted
Rising StarSuperLawyers2015
Cum LaudeUniversity of Richmond2006
Yankee White Top Secret ClearanceUnited States Marine Corps2000
Presidential Service BadgeUnited States Marine Corps2000
Good Conduct MedalUnited States Marine Corps2000

Work Experience

TitleCompany NameDuration
PrincipalThe Law Offices of Donny Knepper2013 - Present
AssociateThe Law Offices of Dan Gaskill2006 - 2013
Presidential Helicopter SquadronUnited States Marine Corps1998 - 2002


Association NamePosition NameDuration
Montgomery County Bar AssociationMember2006 - Present
Maryland State Bar AssociationMember2006 - Present

Legal Cases

Case NameOutcome
State vs. LewisNot Guilty
State vs. AddisonNolle Prosequi

See all Legal Cases 


School NameMajorDegreeGraduated
University of RichmondLawJD - Juris Doctor2006
Pennsylvania State UniversityHuman DevelopmentBS - Bachelor of Science2002