• Illinois
  • U.S. District Court, Northern District of Illinois (including Trial Bar)
  • U.S. Court of Appeals, 7th Circuit
  • U.S. Court of Appeals, 9th Circuit


St. Mary's College (B.F.A.)

University of Notre Dame (M.A.)

Notre Dame Law School (J.D.)


Susan Horner is the chair and founder of Burke, Warren, MacKay & Serritella's Appellate group. She is also a member of the Litigation, Religious Organizations, Internal Investigations, Consumer Financial Services Litigation, and Not-for-Profit and Planned Giving practices.

Ms. Horner works with not-for-profits, corporations and government clients to help them navigate all stages of litigation, from internal investigations to trial and appeal. Ms. Horner’s practice is informed by her experience as a former prosecutor where she handled more than thirty-five jury trials and hundreds of bench trials. Ms. Horner has represented clients in appeals before the Illinois Supreme Court and Appellate Court, as well as the Federal Courts of Appeals for the Seventh and Ninth Circuits. These appeals involve a wide variety of subjects such as the First Amendment, mortgage banking, business torts, professional misconduct, consumer fraud, and defamation. Ms. Horner also advises government clients on compliance with "sunshine laws" such as the Illinois Freedom of Information and Illinois Open Meetings acts.

Ms. Horner is a member of Burke, Warren's Marketing Committee.


  • Naperville Autohaus, Inc. v. Manheim Remarketing, Inc., 2019 IL App (1st) 2019 IL App (1st) 181880-U (reversed dismissal of replevin claim)
  • Protect Our Parks, Inc. v. Chicago Park District, 18 CV 3424 (complaint dismissed)
  • Nancy R. Malek v. Gold Coast Exotic Imports LLC, 2018 IL App (1st) 171459 (reversed order of replevin)
  • Melinda Schweihs v. Chase Home Finance, LLC, et al., 2016 IL 1200041 (affirmed judgment in favor of defendant)
  • Rand Road Property, Inc., et al. v. LD Holdings, LLC, et al., 2014 IL App (1st) 141230-U (reversing in part dismissal of claims)
  • Lab Townhomes, LLC v. Henderson Square Condo. Ass'n, Ill. Sup. Ct. No. 118139 (amicus brief in support of developers' challenge of ordinance claim) 
  • Anderson v. Catholic Bishop of Chicago, 759 F.3d 645 (7th Cir. 2014) (affirmed dismissal of individual and class action claims)
  • Wells Fargo Bank v. Tomas, 2014 IL App (1st) 133555-U (affirmed denial of motion to quash service)
  • EMC Mortg. Corp. v. Kemp, 2012 IL 113419 (2012) (affirmed dismissal of appeal for lack of jurisdiction)
  • LeCompte v. Zoning Bd. of Appeals for Village of Barrington Hills, 2011 IL App (1st) 100423 (affirmed zoning board's cease and desist order)
  • Nelson v. Chicago Park Dist., 408 Ill. App. 3d 53 (1st Dist. 2011) (affirmed dismissal of taxpayer action based on res judicata)
  • Provena Covenant Medical Center v. Department of Revenue, 236 Ill. 2d 368 (2010) (amicus brief in support of religious exemption from property tax)
  • Stepek v. Doe, 392 Ill. App. 3d 739 (1st Dist. 2009) (pursuant to writ of mandamus ordering circuit court to certify question to appellate court; defamation, and intentional infliction of emotional distress claims barred by the First Amendment)


Appellate Lawyers Association

  • Director 2018-2019
  • Co-chair, Guide to Illinois Civil Appellate Procedure
  • Member, Rules Committee

7th Circuit Bar Association

National Diocesan Attorneys Association 



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