Skip to main content


Not yet reviewed

About me

Aaron Zigler is a partner
at Korein Tillery. Prior to his legal career, Mr. Zigler worked in computer
security for a Fortune 500 corporation headquartered in St. Louis. While in law
school, Mr. Zigler continued his interest in computer technology by
concentrating his studies in that area. Mr. Zigler began his legal career as a
law clerk with Carr Korein Tillery in 2000 as he attended St. Louis University
School of Law. He joined the firm as an attorney upon his graduation in 2001
and was elevated to partner on January 1, 2010.

Mr. Zigler has considerable
experience in the prosecution of complex litigation. Immediately following his
admission to practice, Mr. Zigler was heavily involved in the briefing and
presentation of the firm’s successful class certification motions in Turner v. R.J. Reynolds Tobacco Co.,
00-L-113 (Ill.Cir.Ct. Nov. 14, 2001), and Howard
v. Brown & Williamson Tobacco Co
., 00-L-136 (Ill.Cir.Ct. Dec. 18,
2001). Since that time, Mr. Zigler has had significant involvement in the
briefing and presentation of motions for class certification in Prather v. Pfizer Inc., 02-L-480
(Ill.Cir.Ct. Mar. 2, 2004); Barbara's
Sales Inc., v. Intel Corp
., 2004 WL 5723558 (Ill.Cir.Ct. July 12, 2004); Parker v. Sears, Roebuck & Co.,
04-L-716 (Ill.Cir.Ct. Feb. 7, 2007); and Johnson
v. Allstate Ins. Co.
, 07-781 (S.D.Ill. Jan. 7, 2010).

Mr. Zigler has had
responsibility for the briefing and argument in dispositive and jurisdictional
motions in such cases as Barbara's Sales
Inc. v. Intel Corp.
, 02-L-788 (Ill.Cir.Ct., Sept. 3, 2003); SimmonsCooper LLC, v. Arthur J. Gallagher
& Co.
, 04-928-GPM (S.D.Ill. March 8, 2005); Hoormann v. SmithKline Beecham Corp., 04-L-715 (Ill.Cir.Ct. Mar.
31, 2005); Sumner v. Merck & Co.,
Inc., No. 04-864-MJR (S.D.Ill. 2005); Lott
v. Pfizer, Inc.
, 2005 WL 3618027 (S.D.Ill. May 26, 2005); SimmonsCooper LLC v. Arthur J. Gallagher
& Co.
, 04-L-1194 (Ill.Cir.Ct., Aug. 18, 2005); Graham v. Shell Oil Co., 2006 WL 1004725 (S.D.N.Y. Apr 17, 2006); Martin v. Bayer Corp., 04-L-768
(Ill.Cir.Ct., May 23, 2006); Lott v.
Pfizer Inc.
, 2206 WL 2224155 (S.D.Ill. Aug. 2, 2006); Carr v. Gateway Inc., 03-L-1271 (Ill.Cir.Ct. Dec. 12, 2007); Travis v. Allstate Ins. Co., 06-L-332
(Ill.Cir.Ct. May 28, 2008); and Johnson
v. Allstate Ins. Co.
, 2009 WL 3230157 (S.D.Ill. Sept. 30, 2009).

Mr. Zigler also has
extensive appellate experience having responsibility for briefing and arguing a
number of appeals including: Pfizer Inc.
v. Lott
, 417 F.3d 725 (7th Cir. 2005); Hubbert
v. Dell Corp.
, 835 N.E.2d 113 (Ill.App.Ct. 2005); Barbara's Sales, Inc. v. Intel Corp., 857 N.E.2d 717 (Ill.App.Ct.
2006); Hoormann v. Smithkline Beecham
, 5-06-0624 (Ill.App.Ct. 2006); Lott
v. Pfizer Inc.
, 492 F.3d 789 (7th Cir. 2007) (argued); Cooper v. The IBM Personal Pension Plan, 240 F. App’x 133 (7th Cir.
2007); Baldwin v. Mendelsohn, 104487
(Ill. 2007); Hoormann v. Smithkline
Beecham Corp.
, 5-07-0033 (Ill.App.Ct. 2007); Travis v. Allstate Ins. Co., 5-08-110 (Ill.App.Ct. Apr. 10, 2008); Lott v. Pfizer Inc., 5-08-235
(Ill.App.Ct. Oct. 21, 2008) and Carr v.
Gateway Inc.
, 918 N.E.2d 598 (Ill.App.Ct. 2009) (argued).

In 2006, Mr. Zigler began
serving as counsel to the firm and its membership in defense of litigation
stemming from the firm’s restructuring in 2003. This litigation resulted in
eight judgments in favor of his clients that were affirmed in three separate appeals
and the issuance of an anti-suit injunction prohibiting further litigation
against the firm or its employees. See,
e.g., Carr Korein Tillery, LLC v. Carr
, 04-MR-56 (Ill.Cir.Ct. Sep. 29,
2006); Cooper v. IBM Pers. Pension Plan,
240 F. App'x 133 (7th Cir. 2007); Carr
Korein Tillery, LLC v. Carr
, No. 5-06-0548 (Ill.App.Ct. Dec. 27, 2007); Carr v. Tillery, 2008 WL 2782928
(S.D.Ill. July 17, 2008); Carr v. Tillery,
591 F.3d 909 (7th Cir. 2010); Carr Korein
Tillery, LLC v. Carr
, 5-10-60 (Ill.App.Ct. May 5, 2010); Carr v. Tillery, 2010 WL 1963398
(S.D.Ill. May 17, 2010).  

In 2008, The St. Louis
Post-Dispatch published a feature highlighting Mr. Zigler’s practice. Susan
Weich, Lawyer a victor in class actions,
says he fights for little guy
., St. Louis Post-Dispatch, June 29, 2008. Mr.
Zigler's work has also been featured in: The American Lawyer, Aruna Viswanatha,
King & Spalding Lawyer Stirs State
Judge's Ire
, [29] 1 Am.Law., Jan. 2007, at 50, and the National Law
Journal. The Plaintiffs' Hot List, 30
Nat'l L.J. S8 (Nov. 22, 2007).  


Practice areas


  1. Litigation: 33%
  2. Investment Fraud: 33%
  3. Class Action: 33%
    14 years
  4. Unspecified: 1%



Contingent (25-33%)

Attorney endorsements

No endorsements

Endorsements from fellow lawyers are an important consideration for many when selecting the right attorney. Be the first to endorse your colleague!

Are you an attorney? Endorse this lawyer

Contact info

Korein Tillery LLC

One U.S. Bank Plaza
505 N. 7th Street, Suite 3600
St. Louis, MO, 63101

Korein Tillery LLC

205 North Michigan, Suite 1950

Chicago, IL, 60601-5947

Korein Tillery LLC

#10 Executive Woods Court

Belleville, IL, 62226



ILActive And Authorized To Practice Law200205/17/2016
MOGood Standing, Active200101/08/2013
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Trial Lawyer of the Year FinalistPublic Justice2013
Rising StarMissouri Super Lawyers2013
Rising StarMissouri Super Lawyers2012
Rising StarMissouri Super Lawyers2011
Work experience
TitleCompany nameDuration
PartnerKorein Tillery2010 - Present
AttorneyKorein Tillery2001 - 2010
Law ClerkKorein Tillery2000 - 2001
Faculty FellowSt. Louis University School of Law1999 - 2001
Legal cases
Case nameOutcome
Hoormann v. SmithKline Beecham Corp, 2007 WL 1591510 (Ill.Cir.Ct. May 17, 2007)$63,800,000.00 Settlement
Prather v. Pfizer Inc., 02-L-480 (Ill.Cir.Ct. Dec. 2, 2004)$60,000,000.00 settlement
Parker v. Sears, Roebuck & Co., Case No.: 04-L-716 (Ill.Cir.Ct. Jan. 16, 2008)$544,500.000.00 settlement
See all legal cases 
School nameMajorDegreeGraduated
Saint Louis University School of LawLawJD - Juris Doctor2001