Gregory Tsonis


  • Gregory Tsonis
  • Phone: +1 312 499 6779

    Import to Address Book

  • Duane Morris LLP
    190 South LaSalle Street, Suite 3700
    Chicago, IL 60603-3433

Gregory Tsonis practices in the area of employment litigation, representing companies facing high-stakes, complex class action litigation asserting claims under the Americans with Disabilities Act, Fair Labor Standards Act, Civil Rights Act, Biometric Information Privacy Act, and numerous other federal and state statutes.

Mr. Tsonis is a 2015 graduate, with honors, of the University of Chicago Law School and a graduate of the University of Chicago.


  • Illinois
  • U.S. District Court for the Northern District of Illinois
  • U.S. District Court for the Central District of Illinois
  • U.S. District Court for the Western District of Tennessee
  • U.S. District Court for the Eastern District of Michigan


  • University of Chicago Law School, J.D., with honors, 2015
  • University of Chicago, B.A., 2005


  • Duane Morris LLP
    - Associate, 2022-present
  • Seyfarth Shaw LLP
    - Associate, 2021-2022
  • Kirkland and Ellis LLP
    - Associate, 2015-2021

Professional Activities

  • Hellenic Bar Association

Honors and Awards

  • Named to Best Lawyers "Ones to Watch," 2024

Civic and Charitable Activities

  • The Hellenic Initiative/Pan Hellenic Scholarship Foundation

Selected Publications