Katherine M. O’Brien


(312) 762-9487

Katherine M. O’Brien

Kate O’Brien is an experienced civil litigator in federal and state courts. Ms. O’Brien represents public and private clients in all stages of commercial litigation, including cases involving emergency injunctive relief, at the trial and appellate court level, and in arbitration and mediation.

Ms. O’Brien’s practice includes counseling clients on matters related to contract disputes, trade secrets, non-competition agreements, corporate and partnership disputes, government contracts, and intellectual property. She regularly advises clients on complex e-discovery matters and the utilization of computer forensics in non-compete and trade secrets cases.

Ms. O’Brien currently serves as Assistant Treasurer of the Women’s Bar Foundation. 

Prior to joining Tabet DiVito & Rothstein LLC, Ms. O'Brien served as a law clerk for Judge Stuart E. Palmer of the Circuit Court of Cook County, Chancery Division.

Honors and Recognition

  • Fellow, American Bar Foundation
  • Illinois Rising Star, Super Lawyers, 2019
  • Amicus Service Award from the International Municipal Lawyers Association, 2018. The award recognizes attorneys who have been actively involved in legal advocacy for and on behalf of local governments and IMLA, and who have done exemplary work to protect and advance local government interests.
  • Emerging Lawyer, Law Bulletin Publishing Company’s Leading Lawyers, 2017-2019


  • University of Illinois College of Law, J.D., magna cum laude, 2009
  • Notes Editor, University of Illinois Law Review
  • Note, No Match? No Thanks: How the Department of Homeland Security’s No Match Rule Puts the Jobs of Legal Immigrants in Jeopardy, 2009 U. Ill. L. Rev. 975
  • Villanova University, B.A. in Philosophy, with honors, 2006

Bar and Court Admissions

  • Illinois
  • United States Supreme Court
  • United States Court of Appeals for the Seventh Circuit
  • United States District Court for the Northern District of Illinois
  • United States Court of Federal Claims
Katherine M. O’Brien
Katherine M. O’Brien
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