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About me

I handle all manner of criminal matters and traffic in and around Orange County, CA  My objective is to get you the absolute best results possible.  Thanks for looking into my profile. 


I think the most important aspect of performing my service is to provide the free, confidential consultation.  This should open the door to you to call me at your convenience and discuss your case directly.  Many questions I see posted here on AVVO can be answered as, "Contact a lawyer and speak directly to them about your case."  I think it should be simple and harmless to call and spend a few minutes with me rather than searching endless websites about what may or may not happen in your case.  It's the easiest way to get the most beneficial information to you. 




Photos and videos

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Practice areas


  1. Criminal Defense: 40%
    17 years, 500 cases
  2. DUI & DWI: 25%
  3. Violent Crime: 15%
  4. Speeding Ticket: 10%
    17 years, 200 cases
  5. Domestic Violence: 10%



Fixed (always), Free consultation (30 minutes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

32 total 

Are you an attorney? Endorse this lawyer

  • Travis Ashley Newton

    I endorse this lawyer.


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

  • Timothy Peter Brown

    Daniel really raised the bar with criminal defense work.


    Timothy Brown Bankruptcy and debt Attorney
    Relationship: Fellow lawyer in community

Contact info

4911 Warner Avenue
Suite 201
Huntington Beach, CA, 92649


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Top LawyerOC Metro Magazine2010
Outstanding InternRAB Law Office2002
McNichols Appellate (Moot) Court CompetitionJudge McNichols1998
Work experience
TitleCompany nameDuration
OwnerLaw Offices2010 - Present
OwnerLaw Offices2005 - 2010
OwnerLaw Offices of Daniel C. Grupenhagen2004 - 2005
AssociateWallin & Klarich2002 - 2004
AssociateRAB Law Offices2002 - 2002
Deputy City AttorneyCity of Moscow, Idaho1998 - 2002
InternAherin, Rice & Anegon1996 - 1996
PlannerMcDonnell Douglas Corporation & Ibm1989 - 1995
Association namePosition nameDuration
CSUF Legal Aid ClinicVolunteer Attorney2013 - Present
Orange County Criminal Defense Bar AssociationAttorney Member2013 - Present
SW Law Center for Internet ResearchBoard of Directors2012 - 2013
Superior Court Alternate Defense PanelAttorney2012 - 2013
SW Legal Internet Reseach CenterBoard Member2011 - 2012
Orange County Bar AssociationAssociate2009 - 2010
California DUI Lawyers AssociationMember2007 - 2008
D62 ReferreeStaff2007 - 2009
Orange County Bar AssociationAttorney Member2007 - 2008
California DUI Lawyers AssociationAttorney Member2005 - 2006
Legal cases
Case nameOutcome
People v. Steve S.Dismissed
People v. Gary M.Case dismissed
People v. J.G.Dismissed
See all legal cases 
Publication nameTitleDate
SW Law Center JournalCriminal Law Private Practice2012
OC WeeklyUgly Police Mug of the Week2011
OC RegisterOutragous Traffic Fines2010
OC WeeklyTicket Wizard2006
School nameMajorDegreeGraduated
University of Idaho College of LawLawJD - Juris Doctor1998
California State University, FullertonManagement ScienceBS - Bachelor of Science1989
Speaking engagements
Conference nameTitleDate
Career DayLaw as a Career2012
Economics & Small BusinessLaw Office Business Administration2009
WK Annual SeminarBias in Legal Ethics2002
OC Mock Trial CompetitionTrial Judge2002