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The Law Office of Derek R. Ewin.

Derek R. Ewin, Esq.

Derek Ewin - Criminal lawyer, Walnut Creek City

59 Reviews

Derek Ewin has a wealth of Criminal Law experience including more than 30 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, HomicideDrunk Driving/DUI, PossessionPossession for Sale and Sale of Illegal Drugs, Three Strikes, Theft, Burglary, Auto TheftDomestic 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 adult and juvenile cases in the Greater San Francisco Bay Area. He has successfully defended hundreds of 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 drunk driving, criminal law, legal updates and constitutional law at various locations including schools, police academies, and 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 has appeared in several news media, including NBC News, CBS News, SF Weekly, the Mercury News, KTVU Channel Two, the San Francisco Chronicle, the Contra Costa Times and more.

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, mountain biker, shooter and outdoors man. He is also involved as a teacher at his local church.


  • 1986-1990
    • University of California at Los Angeles
    • B.A. in Political Science
  • 1990-1993
    • King Hall School of Law
    • University of California at Davis
    • Juris Doctorate


  • 1992-1993
    • Yolo County District Attorney’s Office
    • Certified Law Clerk
    • Major Narcotic Vender Team
    • Traffic Violation Team
  • November 1993-January 1994
    • Ventura County District Attorney’s Office Lawyer
    • Misdemeanor Team
  • 1994-2005
    Contra Costa County District Attorney’s Office
    Deputy District Attorney

    • Misdemeanor Team – (1994-1995)
    • Felony Team – (1995-1996)
    • Family Support – (1997)
    • Domestic Violence/Felony Team – (1998)
    • Felony Calendar Team – (1999)
    • Felony Filing – (2000)
    • Domestic Violence/Sexual Assault Team – (2001-2004)
    • Gang/Homicide Team – (2004-2005)
  • 2005 – Present
    • Law Office of Derek R. Ewin

Professional Licenses:

  • California State Bar – 1993
  • California Broker’s License – 2005

Membership & Associations:

Past Or Present Member of

  • Contra Costa County Bar Association
  • California State Bar Association
  • California DUI Lawyers Association
  • California Public Defenders Association
  • National Association of Criminal Defense Lawyers

"I had an altercation with the law and have had a few in the past. Derek took me into his office and did not pass judgment. He asked me if I truly wanted to change my lifestyle, if not then he could not under good conscience, work with me..."


"From the initial meeting to the end of my case Derek was very helpful. He had knowledge about what I was expecting, and a lot of experience in handling my case. I’ve already referred him to someone else, and will continue to refer him."


"I need to share with you how much knowing Derek Ewin and having him work on my case has changed our life. Derek was always there for both of us (my wife and I) when we needed him no matter the time of day or the day of the week..."


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59 Reviews

"Derek is an excellent attorney. He is always very well prepared and is an expert in criminal law. He also knows all the judges and district attorneys. You couldn’t ask for a better attorney."

Thomas O’C., Personal Injury Attorney

"Derek is an outstanding attorney who gets exceptional results for his clients. Having worked with Derek in the past, I can attest to the high level of personal attention he gives to each and every case. I highly recommend Derek to anyone..."

Matthew O’C., DUI and DWI Attorney

"I endorse this lawyer. Mr. Ewin is a very experienced and knowledgeable attorney. He is conscientious of his clients needs and takes the time to help them understand the issues in their case."

Peter J., DUI and DWI Attorney

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6 Endorsements

Derek R. Ewin - Criminal Lawyer, Walnut Creek City

Derek R. Ewin, a seasoned criminal defense attorney offers expert legal representation in serious and violent crimes.

Call now for a free consultation (925) 940-9254.

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