W. Gregory Aimonette

W. Gregory Aimonette

Managing Partner, Chicago Office

Tel: 630-248-5780

Fax: 414-259-0610

Email: wgaimonette@yostbaill.com

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Assistant: Sydney Achin

Tel: 414-203-2044

Fax: 414-259-0610

Email: sachin@yostbaill.com

Assistant: Katie Nitz

Tel: 414-203-2057

Fax: 414-259-0610

Email: knitz@yostbaill.com

Gregory Aimonette is the managing partner of the Chicago office of Yost & Baill. Greg primarily handles a national subrogation practice and has litigated a large variety of industrial, commercial and residential property damage losses. Greg prepares and postures every case for a potential trial from the very first intake. This allows him to best represent his client’s interests from beginning to end and conduct an appropriate risk versus reward analysis in order to maximize recovery at a minimal cost. Greg understands that the best result is the one that best serves the interests of his client.

As part of this practice, Greg handles matters throughout the entire United States in both state and federal courts. He has also assisted in handling and providing counsel in matters in Canada, Brazil, France, Germany and the United Kingdom.

Greg received his Bachelor of Arts Degree from DePauw University in 1994 and his Juris Doctor from Northern Illinois University College of Law in 1997. After graduation Greg was a Cook County Assistant State’s Attorney prosecuting cases in the misdemeanor and felony courts of Chicago and the surrounding suburbs. Following working in criminal prosecution, Greg defended manufacturers and construction contractors, which led him to beginning his national subrogation practice.

In his limited free time, Greg relives his doubtful glory days coaching sports, teaching and supporting his wife in her calling as an Ordained Lutheran Minister.


  • J.D., Northern Illinois University College of Law, 1997
  • B.A., DePauw University, 1994

Court Admissions:

  • United States Supreme Court
  • U.S. District Court, Northern District of Illinois including Trial Bar
  • U.S. District Court, Central District of Illinois
  • U.S. District Court, Eastern District of Michigan
  • U.S. District Court, Northern District of Indiana
  • U.S. District Court, Eastern District of Arkansas
  • U.S. District Court, Western District of Arkansas
  • U.S. District Court, Western District of Wisconsin
  • U.S. District Court, District of Nebraska

Bar Admissions

  • Illinois
  • Pro hac admitted in Alabama, Arkansas, Florida, Indiana, Iowa, Michigan, Missouri, Nebraska, Ohio and Wisconsin

Professional Associations & Memberships:

  • Chicago Bar Association
  • Illinois State Bar Association (Member, civil practice and procedure committee)
  • DuPage Bar Association
  • Western Loss Association/ Loyal Order of the Blue Goose (past president)
  • Justinian Society of Lawyers
  • International Association of Arson Investigators, Associate Member
  • National Association of Subrogation Professionals (regular speaker)


  • Agricultural Equipment Recovery Updates – “Current Developments in the Subrogation of Agribusiness” – NASP Annual Conference Fall 2023, Colorado Springs, CO.
  • “Love Thy Neighbor –  Subrogation Between Neighboring or Closely Related Entities” – NASP Annual Conference Fall 2020 (virtual).
  • “How to Maximize Your Bottom-Line:  Recoveries at a Fraction of the Litigation Cost”–  NASP Spring Conference 2019, Palm Springs, CA.
  • “Subrogation Considerations with Water-Based Fire Protection Systems” – NASP Annual Conference Fall 2018, Orlando, FL.

Significant Reported Decisions:

  • People v. Orneleas, 295 Ill.App.3d 1037, 693 N.E.2d 1247, 230 Ill.Dec. 496 (1st Dist. 1998).
  • Strahs v. Tovar’s Snowplowing, Inc., Walgreen Company, and Bond Drug Company of Illinois,
  • 349 Ill.App.3d 634, 812 N.E.2d 441, 285 Ill.Dec. 621(1st Dist. 2004).
  • Travelers Prop. Cas. Co. of Am. v. ArcelorMittal USA Inc, 2019 IL App (1st) 180129.
  • GE Energy Power Conversion France SAS, Corp., fka Converteam SAS v. Outokumpu Stainless USA, LLC, et al., U.S.S.Ct. 18-1048 (June 1, 2020).