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Erin Webster O'Brien

Erin Webster O'Brien

also known as Erin Webster O'Sullivan

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About Me

Ms. O'Brien graduated with highest honors from Lewis University in May, 2000. She earned a Bachelor of Arts Degree, double majoring in Criminal / Social Justice and American Studies (History Department). While an undergraduate student, she was a member of the Scholars Academy, Pre-Law Club, and Mock Trial Team. 

In 2001, Ms. O'Brien worked for Target Corporation as a human resources manager where she recruited new team members, and helped run the Orland Park Target store. Ms. O'Brien then attended DePaul University College of Law and graduated with a Juris Doctorate in May, 2004. While a law student, she was employed at the National Anti-Vivisection Society as a legal analyst helping maintain Ms. O'Brien also clerked with Chuck Bretz & Associates P.C. and helped maintain family, felony, and personal injury files.

Ms. O'Brien was licensed as an attorney with the Supreme Court of Illinois in November, 2004 and the United States District Court for the Northern District of Illinois in January, 2005. Since her admittance in 2004, Ms. O'Brien was employed as an associate attorney at Chuck Bretz & Associates, P.C. where she concentrated in family law, but also had litigation experience in criminal defense, personal injury, and administrative hearings. She opened her own law practice in November, 2008 and concentrates in family law.

In March, 2008, Ms. O'Brien earned a Professional Certification in Divorce Mediation Skills Training from the School of Continuing Studies at Northwestern University. Shortly thereafter, she branched out from the typical family law litigation and became a Fellow of the Collaborative Law Institute of Illinois (CLII) and of the International Academy of Collaborative Professionals. More information about collaborative law can be found at

Ms. O'Brien was recently named a 2015 Top 40 Lawyer Under 40 in family law by The American Society of Legal Advocates.


Photos and Videos

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Practice Areas


  1. Divorce & Separation: 50%
    6 years
  2. Mediation: 30%
    6 years
  3. Family: 20%


Payment Types:

Cash, Check, Credit Card

Attorney Endorsements

14 total 

  • Marlene E. Siedlarz

    I endorse this lawyer.


    Marlene Siedlarz Family Attorney
    Relationship: Fellow lawyer in community

  • Eric Gerard Zelazny

    I endorse this lawyer.


    Eric Zelazny Chapter 7 Bankruptcy Attorney
    Relationship: Fellow lawyer in community

Contact Info

Erin Webster O'Brien, P.C.

56 North Chicago Street
Joliet, IL, 60432


ILActive And Authorized To Practice Law200408/17/2015

Professional Misconduct

We have not found any instances of professional misconduct for this lawyer.
Avvo Contributions
Legal Answers
Award NameGrantorDate Granted
Top 40 Lawyer Under 40 in Family LawThe American Society of Legal Advocates2015
Professional of the Year Representing the Family Law IndustryCambridge Who's Who2010
Professional Certification in Divorce Mediation Skills TrainingSchool of Continuing Studies at Northwestern University2008
ArbitratorWill County Mandatory Arbitration Program2007
Work Experience
TitleCompany NameDuration
OwnerErin Webster O'Brien, P.C.2015 - Present
OwnerErin Webster O'Sullivan, P.C.2008 - 2015
Mock Trial CoachLewis University2007 - 2008
Associate AttorneyChuck Bretz & Associates, P.C.2004 - 2008
Law ClerkChuck Bretz & Associates, P.C.2003 - 2004
Legal AnalystNational Anti-Vivisection Society2001 - 2002
Association NamePosition NameDuration
Will County Bar AssociationDirector2011 - Present
Rotary Club of JolietMember2009 - Present
Cambridge Who's Who Registry of Executives, Professionals, and EntrepreneursMember2009 - Present
Will County Women's Bar AssociationMember2009 - Present
Collaborative Law Institute of IllinoisFellow2008 - Present
International Academy of Collaborative ProfessionalsMember2008 - Present
National Association of Professional WomenMember2008 - 2010
American Association for JusticeMember2007 - Present
Will County Bar AssociationMember2004 - Present
Phi Alpha Theta, National History Honors SocietyMember1999 - Present
Delta Epsilon Sigma, National Catholic Honor SocietyMember1999 - Present
School NameMajorDegreeGraduated
DePaul University College of LawN/AJuris Doctor2004
Lewis UniversityCriminal / Social Justice & American StudiesBachelor of Arts2000