James G. Argionis


Jim has extensive experience and an impressive record of success as a business trial lawyer. His practice encompasses a wide range of business and commercial litigation disputes, including those related to restrictive covenants, product defects, breach of contracts, business torts, fraud, defamation, libel, slander, trademark/copyright infringement, unfair competition, franchise disputes, partnerships, corporate and limited liability company disputes, errors and omissions claims against a variety of professionals including insurance agents and brokers, securities brokers, lawyers and accountants, civil rights and employment defense, corporate investigations, including regulatory and criminal matters, and real estate related litigation.

Jim regularly represents clients ranging from sole proprietors and practitioners to large corporate entities and institutions, both in pursuing claims and in defending and trying lawsuits in various commercial litigation matters. He has experience representing technology based companies, hospitals, medical professionals, insurance producers, law and accounting firms and individual lawyers and accountants, against claims and potential claims and with respect to subpoenas for depositions and records, administrative proceedings, criminal matters, and risk management issues. Jim’s successful representations have involved winning cases through dispositive motions and at trial when necessary. He has litigated in both federal and state courts and at both the trial and appellate court levels. Jim also has significant experience prosecuting and defending temporary restraining orders/injunctions.

Admitted to practice in the state of Illinois, the U.S. District Court for the Northern District of Illinois, including the Trial Bar, and the U.S. District Court for the Central District of Illinois, Jim has been involved in federal and state court litigation around the country.

Jim’s numerous successful representations have earned him recognition, for three consecutive years (2009, 2010, 2011), as an Illinois Super Lawyers Rising Star, an honor conferred upon less than 2.5 percent of the top up and coming Illinois lawyers who are under 40 years old.

Jim has served, by gubernatorial appointment and Illinois State Senate confirmation, as chairman of the Illinois Department of Employment Security Advisory Board. He has served in that capacity for three different administrations. He also serves, by Mayoral appointment and City Council confirmation, as a Commissioner of the City of Park Ridge’s Planning and Zoning Commission and as chairman of its O’Hare Airport Commission. He has been elected to several terms as a Chicago Public School System Local School Council representative, and has volunteered in the Chicago Public School System, District 64 School System, the Chicago Greek Orthodox Archdiocese, the American Hellenic Educational Progressive Association (AHEPA), and the Park Ridge Police Parent Patrol.

Jim received his bachelor's degree, summa cum laude, from the Honors Department, in economics from Loyola University of Chicago in 1992 and served as a student representative on the Loyola University board of trustees. He received his law degree from Loyola University of Chicago Law School in 1995 where he served as law review executive editor and as an assistant Legal Writing/Moot Court instructor. Jim is fluent in Greek.




Cozen O’Connor Attorney Jim Argionis Honored by Maine Township For Exceptional Community Service

April 13, 2022

Cozen O’Connor attorney Jim Argionis, a member of the firm’s Commercial Litigation practice in Chicago, has been named the 2022 recipient of the Sgt. Karen Lader Memorial Good Citizen Award.

Community crusader

June 05, 2020

The Loyola School of Law ran an alumni profile of Jim Argionis recognizing his dedication to his practice and community and highlighting some of the community accolades his efforts have garnered.

Cozen O’Connor Attorney Jim Argionis Appointed Chairman of Park Ridge’s Planning and Zoning Commission

November 06, 2019

Jim Argionis, a member of the firm’s Commercial Litigation practice in Chicago, has been appointed Chairman of the Park Ridge Planning and Zoning Commission.

Jim Argionis: Acting Locally

April 05, 2019

Jim Argionis, a member in the firm's Commercial Litigation Department, was the subject of a feature story in Chicago Lawyer magazine.

Shout Out: Jim Argionis, attorney and Park Ridge 'Community Star'

February 13, 2019

Jim Argionis was interviewed by the Chicago Tribune/ Pioneer Press highlighting his recent Park Ridge Chamber of Commerce "Community Star" award.

Cozen O’Connor Attorney Jim Argionis Honored for Exceptional Community Service by Park Ridge Chamber of Commerce

January 10, 2019

Jim Argionis, a member of Cozen O'Connor's Litigation Department in Chicago, has been recognized by the Park Ridge Chamber of Commerce as a "Community Star."


Frequently Asked Questions: Financial Assistance for Small, Mid-sized and Distressed Sector Businesses

April 22, 2020

James Argionis and Steven Dickinson wrote a white paper in conjunction with Gallagher on guidance in regard to the CARES Act and what this means for different types of businesses.

Illinois Announces More than $90 Million Emergency Assistance for Small Businesses

March 26, 2020

James Argionis discusses various grants and loans available to small businesses in Illinois and Chicago.

Illinois Shuts Down Most Gatherings, Expands Unemployment Benefits [Alert]

March 17, 2020

Jim Argionis discusses recent executive orders impacting Illinois's citizens and businesses.


  • Loyola University Chicago School of Law, J.D., 1995
  • Loyola University of Chicago, B.A., summa cum laude, 1992

Awards & Honors

Illinois Super Lawyers Rising Star

"Community Star" Award from the Park Ridge Chamber of Commerce 

Sgt. Karen Lader Memorial Good Citizen Award, 2022 Recipient 

  • Illinois
  • U.S. District Court -- Northern District of Illinois
  • U.S. District Court – Northern District of Illinois Trial Bar
  • U.S. District Court -- Central District of Illinois
  • U.S. Court of Appeals for the Seventh Circuit
  • U.S. District Court -- Eastern District of Michigan
  • Hellenic Bar Association
  • Chicagoland Chamber of Commerce