Peter Sullivan is the chairman of Hinshaw & Culbertson LLP. He directs the strategy and operations for the firm.

Peter is a seasoned litigator who handles complex professional liability and commercial matters. In particular, he defends actions against accountants and attorneys, director and officer liability and coverage cases, consumer class action cases, and breach of contract cases.

Peter is a dedicated and decisive leader, known for his intellect and enthusiasm. Throughout his career, Peter has taken on numerous leadership roles within Hinshaw, including serving as a long standing member of the firm's Management Committee, past chair of the Business Litigation Practice Group, and former regional director.

Professional Affiliations

  • American Bar Association
  • Chicago Bar Association
  • Defense Research Institute
  • Illinois State Bar Association

Honors & Awards

  • Selected by his peers for inclusion in The Best Lawyers in America© for Commercial Litigation, 2016 – 2024
  • Recognized on the Super Lawyers list by Illinois Super Lawyers magazine, 2005 – 2024
  • Top 10 Illinois Legal Malpractice Defense list, Leading Lawyers, 2018
  • Trial Excellence Award, Defense – Attorney Malpractice, Illinois Jury Verdict Reporter, 2011
  • Holds the AV® Peer Review Rating from Martindale-Hubbell, its highest rating for ethics and legal ability
  • Recognized by his peers as a "Leading Lawyer" in: Commercial Litigation; Insurance, Insurance Coverage & Reinsurance Law; Products Liability Defense Law; and Professional Malpractice Defense Law


  • "The Year in Review 2023 – Significant Attorney Malpractice and Ethics Decisions," Hinshaw’s 23rd Annual Legal Malpractice & Risk Management Conference (LMRM), Chicago, Illinois, March 6, 2024
  • "Lessons from the Professional Liability Front: Claims CAN Happen to You," ICPAS Midwest Accounting Show, Rosemont, Illinois, August 23, 2016

J.D., with honors, Loyola University Chicago School of Law, 1983

B.A., University of Notre Dame, 1980