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Derek Richard Ewin

About me

Derek Ewin has a wealth of Criminal Law experience including more than thirteen years in County Prosecutors’ Offices.  Eleven of those years Mr. Ewin worked as a Deputy District Attorney in Contra Costa County.   As a Deputy DA, Mr. Ewin prosecuted thousands of cases, including but not limited to:  Robbery, Homicide, Drunk Driving/DUI, Possession, Possession for Sale and Sale of Illegal Drugs, Three Strikes, Theft, Burglary, Auto Theft, Domestic Violence, Assault with Deadly Weapon, Illegal Firearms, Vandalism, Sex Crimes, Stalking, Gang cases, Arson and Drive By Shootings.  At the DA's Office, Mr. Ewin worked in several divisions including Misdemeanors, Felony Trial Team, Calendar, Juvenile, Felony Filing, Domestic Violence/Sexual Assault, Preliminary Hearings and Homicide/Gangs.  As a Criminal Defense Attorney, Mr. Ewin has handled numerous cases in the Greater San Francisco Bay Area.  He has successfully defended misdemeanor, felony and drunk driving cases. 

Mr. Ewin’s extensive experience includes Jury Trials, Court Trials, Preliminary Hearings, Motions to Suppress, Motions to Dismiss, Discovery Motions, Pre-trial Negotiations, Plea Bargaining, Sentencing Hearings, Probation Violation Hearings, Investigations, Mental Defenses, Victim Representation, DMV License Suspension Hearings and Post Conviction Reductions and Dismissals.  He has also lectured in criminal law, legal updates and constitutional law to various local police agencies.   In law school, Mr. Ewin focused on Criminal Law and Trial Practice.  He tutored legal writing and competed in the National Moot Court competition.

Mr. Ewin has a reputation of integrity, honesty and skill with local prosecutors, defense attorneys, judges and court staff.  Mr. Ewin works tirelessly to help his clients get their lives back in order and to get them free of the Criminal Justice System.  Clients and Former Clients continually call and write to tell Mr. Ewin how his representation of them has changed their lives for the better.

Mr. Ewin was born and raised in the East Bay, where he continues to reside with his family.  He is an avid dirt bike rider, wake-boarder, shooter and outdoorsman.  He is also involved as a teacher at his local church.


Photos and videos

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Practice areas


  1. DUI & DWI: 50%
    23 years, 1 thousand cases
  2. Criminal Defense: 50%
    23 years, 1 thousand cases



Fixed (sometimes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

7 total 

Are you an attorney? Endorse this lawyer

  • Bruce Timothy Flynn

    I have known Derek for almost 20 years. I worked with Derek in the Contra Costa County District Attorney's Office for several years. He was always an outstanding ethical prosecutor. I have also had the pleasure of observing Derek's skills as a defense lawyer. Derek is one of the most effective defense attorneys in the Bay Area. This is so because he is well respected as a an excellent trial attorney. He is also well-known for his integrity. I would highly recommend Derek Ewin to a friend in need of a good criminal defense or DUI attorney.


    Bruce Flynn Criminal defense Attorney
    Relationship: Co-worker

  • Travis Ashley Newton

    I endorse this lawyer.


    Travis Newton DUI and DWI Attorney
    Relationship: Fellow lawyer in community

Contact info

Law Office of Derek R. Ewin

201 North Civic Drive
Suite 225
Walnut Creek, CA, 94596


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Justice of the Moot Court Board - National TeamU.C. Davis School of Law1993
Work experience
TitleCompany nameDuration
Lead AttorneyLaw Office of Derek R. Ewin2005 - Present
Deputy District AttorneyContra Costa District Attorney's Office1994 - 2005
Volunteer AttorneyVentura County District Attorney's Office1993 - 1994
Court Certified Legal InternYolo County District Attorney's Office1992 - 1993
Association namePosition nameDuration
Contra Costa County Bar AssociationMember2005 - Present
California State Bar AssociationMember1993 - Present
California DUI Lawyers AssociationMember2012 - 2013
California Public Defenders AssociationMember2010 - 2013
National Association of Criminal Defense LawyersMember2008 - 2013
Legal cases
Case nameOutcome
People v. Paul BlandExample of Homicide Case when I was a DA
People v. J.D.Felony Assault with firearm reduced to misdemeanor
People v. M.D..17 BAC DUI case reduced to wet reckless
See all legal cases 
School nameMajorDegreeGraduated
University of California at Davis School of LawLawJD - Juris Doctor1993
University of California - Los AngelesPolitical ScienceBA - Bachelor of Arts1990
Speaking engagements
Conference nameTitleDate
Every 15 MinutesLegal Consequences for a DUI2013
Every 15 MinutesLegal Consequences for a DUI2010
Police Academy TrainingConstitutional Law1999
Officer TrainingConstitutional Law1995