John Brennock

Senior Associate

PHONE: 630-453-6800
1771 West Diehl Road, Suite 120
Naperville, IL 60563

Practice Areas

  • Real Estate
  • Probate
  • Estate Planning
  • Litigation

John primarily handles state court litigation and concentrates his practice in the areas of real estate law (transactional and litigation), estate planning and probate (decedent’s estates and guardianships), small business law, civil litigation and appeals.

He serves as an appointed member of the Illinois State Bar Association’s Standing Committee on Delivery of Legal Services (2016-present) and the Illinois State Bar Association’s Standing Committee on Judicial Evaluations – Cook County (2017-present).

He has spoken at several events, served as a competition judge for a number of past American Bar Association and Chicago Bar Association student competitions, and has previously volunteered with the Chicago Bar Association’s Juvenile Justice Mentoring Initiative and Wills for Heroes programs.


  • Western Michigan Thomas M. Cooley Law School, 2008, Juris Doctorate cum laude
  • John Carroll University, 2005, B.A. Communications

Bar Admission

  • Illinois State Bar


  • American Bar Association
  • Chicago Bar Association
  • Illinois State Bar Association
  • DuPage County Bar Association