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About me

Mr. Arendt represents clients in all phases of litigation and disputes. His practice focuses on all aspects of family law, including divorce and custody litigation, commercial litigation, and state and federal appeals. Mr. Arendt has over 25 years of trial experience in the courtroom and negotiating settlements. Mr. Arendt opened his own law firm in 1999 in Burr Ridge, Illinois, after practicing for 14 years at a downtown Chicago litigation law firm. As a skilled, experienced, and aggressive trial lawyer, Mr. Arendt has the straight-forward and honest approach necessary to best provide effective representation to his clients. He ensures that his clients are consulted, involved, and empowered during each step of the legal process.


Photos and videos

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Practice areas


  1. Divorce & Separation: 35%
  2. Family: 25%
  3. Litigation: 20%
  4. Business: 10%
  5. Employment & Labor: 10%



Retainer (sometimes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

8 total 

Are you an attorney? Endorse this lawyer

  • Joseph Pierce O'Brien

    I endorse this lawyer.


    Joseph O'Brien Divorce & Separation Attorney
    Relationship: Fellow lawyer in community

  • Sean Michael Lazzari

    I endorse this lawyer. Mr. Arendt is a professional attorney who is well versed in his areas of practice. He is a an excellent advocate for his clients and a professional to work with


    Sean Lazzari Divorce & Separation Attorney
    Relationship: Opposing Counsel on matter

Contact info

William J. Arendt & Associates, P.C.

7035 Veterans Boulevard
Suite A
Burr Ridge, IL, 60527-5677


ILActive And Authorized To Practice Law198511/12/2015
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Admitted to PracticeUnited States Supreme Court2008
Executive Editor of the Law ReviewJohn Marshall Law School1985
Work experience
TitleCompany nameDuration
PartnerWilliam J. Arendt & Associates, P.C.1999 - Present
PartnerField, Golan & Swiger1993 - 1999
PartnerKanter & Mattenson, Ltd.1985 - 1993
Association namePosition nameDuration
Will County Bar AssociationMember2005 - Present
Illinois State Bar AssociationMember1999 - Present
DuPage County Bar AssociationMember1999 - Present
Illinois State Bar Association, Family Law SectionMember1999 - Present
Illinois State Bar Association, General Practice, Solo, and Small Firm SectionMember1999 - Present
Publication nameTitleDate
John Marshall Law ReviewCameras in the Courtroom1985
John Marshall Law ReviewSearch & Seizure on the High Seas1984
School nameMajorDegreeGraduated
John Marshall Law School, ChicagoLawJD - Juris Doctor1985
Loyola University ChicagoN/ABA - Bachelor of Arts1982
Speaking engagements
Conference nameTitleDate
Bar Review CourseIllinois Civil Procedure1993
Sonja LiveMen Seeking Custody1992
Oprah Winfrey ShowPaternity Testing1991