Heyl Royster

Gregory Flatt

Edwardsville, IL

Joined Firm in 2010

Greg provides something you can depend on in the ever-changing world of litigation - consistent, engaged, and high-level representation.

  • Emerging Lawyer by Law Bulletin Media℠, 2018 - 2023
  • Former Editor of Washington University Law Review
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Gregory Flatt

Attorney in Edwardsville, IL

In his more than 10 years as a practicing attorney at Heyl Royster, Greg focuses on a wide range of cases, from asbestos defense work to local government representation to class actions. His ability to efficiently handle clients' needs, coupled with a focus on getting to know those clients personally, makes each of them feel like they've got an attorney solely dedicated to them. He prides himself on showing his clients how consistent preparation, effective communication, and a little bit of old-fashioned grit can provide a foundation for success in even the most complex legal needs. 

One probably wouldn't have predicted Greg's path to the legal profession except for a borderline unhealthy obsession with Law & Order at an early age. He studied English at the University of Iowa, dedicated to honing his writing skills. After graduation, Greg moved to the Metro East and began Washington University Law School. While attending law school, Greg clerked for Magistrate Judge Donald G. Wilkerson in the U.S. District Court's Southern District of Illinois, the Madison County State's Attorney's Office, and the General Crimes Division of the U.S. Attorney's Office for the Southern District of Illinois. Upon graduation, he began seeking a law firm that offered a local Metro East presence with the scope of representation, quality of attorneys, and reputation of a national firm and found a perfect fit at Heyl Royster. 

Greg loves listening to music when not in the office (and sometimes even when he's in the office). He plays guitar, mandolin, dulcimer, and piano and occasionally pops into a local open mic night to entertain the patrons to a motley collection of originals and covers.



J.D., Washington University School of Law

B.A., University of Iowa, English

Licensure(s) and Admission(s)

State Courts of Illinois

State Courts of Missouri

United States District Court for the Eastern District of Missouri

United States District Court for the Southern District of Illinois

United States District Court for the Western District of Missouri

Professional Affiliations

Bar Association of Metropolitan St. Louis

Illinois State Bar Association

Madison County Bar Association

The Missouri Bar Association



"Intentional Act Exclusion," chapter in Commercial and Professional Liability Insurance Practice Handbook, Illinois Institute for Continuing Legal Education Handbook (2014, 2019)

"All in Your Head: A Comprehensive Approach to Somatoform Disorders in Adult Disability Claims," Washington University Law Review (2010)


  • Emerging Lawyer℠ by Law Bulletin Media, 2018 -2023
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