Paul F. Stack


  • University of Arizona – B.S. (1968)
  • Georgetown University – J.D. (1971)
  • Editor, Georgetown University Law Journal

Bar Admission

  • United States Supreme Court
  • State of Illinois Supreme Court
  • U.S. Courts of Appeals for Seventh, Ninth, and Federal Circuits
  • U.S. District Court for the Northern District of Illinois (Member, Trial Bar)


  • Law Clerk to United States District Judge, 1971-72
  • Assistant U.S. Attorney for Northern District of Illinois, 1972-75

Professional Memberships

  • American Bar Association
  • International Trademark Association


  • Martindale-Hubbell rated “A-V”
  • Who’s Who in America
  • Who’s Who in the World

Paul has served as a managing director of Stack & O’Connor Chartered since 1976. He counsels a wide variety of clients on intellectual property and licensing issues, and frequently serves as local counsel in commercial and intellectual property litigation pending in Chicago’s federal and state courts. His practice is concentrated on trademark and copyright prosecution; licensing, and enforcement; patent litigation; and maintenance of international intellectual property portfolios.

Because of his 40 plus years of continuous practice in Chicago’s federal courts, Paul frequently acts as Chicago counsel in patent litigation, including ANDA (Hatch-Waxman) litigation, and provides strong legal and logistical support for outside firms litigating such cases in Chicago.

Paul is a visible figure in Chicago’s civic community. He was appointed by Mayor Harold Washington to serve on the Mayor’s Advisory Committee on the design and construction of Chicago’s new Central Library (now the Harold Washington Library Center), and was reappointed to that position by Mayor Eugene Sawyer upon the death of Mayor Washington. Paul has also served in various elected positions, including Village President of Riverside, Illinois, the Board of Education of Riverside’s high school, a Trustee of Riverside’s public library, and a Governing Member of the Chicago Zoological Society which operates the Brookfield Zoo.

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