Matthew P. Diehr: Lawyer with Husch Blackwell LLP

Matthew P. Diehr

St. Louis,  MO  U.S.A.

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Experience & Credentials

Practice Areas

  • Technology
  • Manufacturing & Transportation
  • Appellate
  • Investigations & Litigation
  • Business Litigation
  • Manufacturing
  • Government Compliance
Contact InfoTelephone: 314.480.1916
Fax: 314.480.1505
University Tulane University,, B.A., Political Economy/Political Science, cum laude; Dean's Honor Scholarship
Law SchoolSaint Louis University School of Law,, J.D., cum laude, 2009; Saint Louis University Law Journal, editor; Academic Excellence Awards for highest grades in Antitrust Laws, Business Associations, Constitutional Law, Contracts, Criminal Procedure and Property
Admitted2009, Missouri; 2009, U.S. District Court, Eastern District of Missouri; 2009, U.S. District Court, Western District of Missouri; 2014, U.S. District Court, District of Kansas; 2012, U.S. Court of Appeals, Eighth Circuit; 2013, U.S. Tax Court; 2011, Illinois

Professional Associations and Memberships

The Bar Association of Metropolitan St. Louis

•The Illinois Bar

•The Missouri Bar


Matt represents and advises clients in a wide variety of lawsuits and regulatory disputes across the United States. He is closely involved with the Government Compliance, Investigations & Litigation team and practices in federal courts from California to New York, defending clients accused of securities fraud, insider trading and money laundering. This practice has included many investigations by the Department of Justice and related entities that have been resolved without charges filed or other discipline imposed.

Matt also offers considerable litigation experience in Missouri and Illinois state courts and in all stages of litigation, including discovery, motion practice, trial and appeals. He has served as counsel in jury trials in Missouri state and federal courts and has argued appeals before the U.S. Court of Appeals, Eighth Circuit. Matt has significant experience in the U.S. District Court, Eastern District of Missouri, where he has represented parties in a range of civil and criminal matters and provides pro bono services as an advocate for unrepresented civil litigants. He also has achieved favorable outcomes for clients in alternative dispute resolutions, such as mediation and arbitration.

Civic Involvement

St. Louis University High School Alumni Board

•Young Friends of the Arc, nominating chair, 2012-present


U.S. Attorney's Office, Southern District of Illinois, 2008

• The Hon. Audrey G. Fleissig, U.S. District Court, Eastern District of Missouri, 2008

Business Insights

Business Insights

4.02.14 Avoiding Privilege Pitfalls: Barko Calls for Caution

3.01.14 Federal Sentencing for Economic Crimes - Are We There Yet? Calculating Loss in Securities Fraud - Does the Modified Rescissory Method Fix the Broken Federal Sentencing Guidelines? Investigations Quarterly Article

1.14.14 For Whom the Bellwether Tolls: The Eighth Circuit Holds an Exemplar Trial May Qualify as a Civil Action to be Tried Jointly Under CAFA Technology, Manufacturing & Transportation Blog

7.01.13 Sentencing and Restitution Issues in Criminal Tax Fraud Cases, St. Louis Bar Journal Article

1.01.09 The State of Affairs Regarding Counseling for Expectant Parents of a Child with a Disability: Do ACOG's New Guidelines Signify the Arrival of a Brave New World? Saint Louis University Law Journal

In The News

9.03.13 Six Attorneys Join Husch Blackwell's Government Compliance and Investigations Team in St. Louis, Kansas City
News Release


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Avoiding Privilege Pitfalls: Barko Calls for Caution
Matthew P. Diehr,Matthew T. Schelp, April 3, 2014
Corporations conducting internal investigations need to be wary that information learned and materials generated in the course of these investigations may later fall into the hands of adversaries in litigation.

For Whom the Bellwether Tolls: The Eighth Circuit Holds an Exemplar Trial May Qualify as a Civil Action to be ‘Tried Jointly’ Under CAFA
Matthew P. Diehr, January 17, 2014
Corporate clients defending class action lawsuits in state courts within the Eighth Circuit should take note of the recent decision Atwell, et al. v. Boston Scientific Corporation. One portion of the Class Action Fairness Act of 2005 allows for removal of “mass actions” from state...
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Office Information

Matthew P. Diehr

190 Carondelet Plaza, Suite 600
St. LouisMO 63105-3441


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