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Practice areas


  1. DUI & DWI: 20%
  2. Violent Crime: 20%
  3. Criminal Defense: 20%
    32 years
  4. Domestic Violence: 15%
  5. Other: 25%
  6. More 



Free consultation (120 minutes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

3 total 

Are you an attorney? Endorse this lawyer

  • Chris Duerr

    Heather is a professional, competent and diligent attorney who is well known in Chester County. Highly recommended


    Chris Duerr Land use and zoning Attorney
    Relationship: Opposing Counsel on matter

  • Sherri Lynn Eyer

    I've known Heather Mattes to be a very well-prepared, knowledgeable and caring lawyer. She takes pride in doing good work. I highly recommend her!


    Sherri Eyer Criminal defense Attorney
    Relationship: Fellow lawyer in community

Contact info

105 South High Street, Suite 2A
West Chester, PA, 19382


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Preeminent 5.0 out of 5Martindale-Hubbell2014
Annual AwardBikers Against Child abuse2004
Work experience
TitleCompany nameDuration
Adjunct ProfessorDrexel University College of Medicine2006 - Present
PrincipalLaw Offices of Heather J. Mattes2006 - Present
Assistant District AttorneyDelaware County District Attorney's Office1989 - 2005
Assistant Public DefenderChester County Public Defender's Office1985 - 1988
Association namePosition nameDuration
Pennsylvania Association of Criminal Defense LawyersChair Membership2015 - Present
Homeowner's AssociationSecretary2010 - Present
American Bar AssociationN/A2007 - Present
Pennsylvania Bar AssociationN/A2006 - Present
Chester County Bar AssociationN/A2006 - Present
Pennsylvania Association of Criminal Defense LawyersBoard of Directors2005 - Present
Delaware County Bar AssociationN/A2003 - Present
School nameMajorDegreeGraduated
Villanova University School of LawLawJD - Juris Doctor1984
Pennsylvania State UniversityCommunications Studies, PhilosophyBA - Bachelor of Arts1981
Speaking engagements
Conference nameTitleDate
White Collar SeminarWomen In The Law2015