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William B. Mateja


Dallas, TX
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Bill Mateja is a Principal in the Dallas office of Fish & Richardson P.C. Prior to joining the Firm in January 2005, he served as Senior Counsel to U.S. Deputy Attorneys General Larry Thompson and James Comey in Washington, D.C., where he also served as point person for the Presidents Corporate Fraud Task Force while also overseeing the Justice Departments white collar, health care fraud, and corporate fraud efforts. Mr. Mateja also served as the Justice Departments Special Counsel for Health Care Fraud, and chaired the Attorney Generals working group on sentencing policy.

Mr. Mateja is a highly regarded trial attorney who uses his 13 years of experience with the Justice Department in Texas and Washington, D.C., coupled with over 25 years of legal experience, to successfully represent companies and individuals in "high stakes" government and internal investigations, civil enforcement actions, lawsuits, and criminal prosecutions across the country. These cases involved a broad array of subject matters, including corporate accountability, fraud and abuse, securities investigations and litigation, health care fraud, and government regulatory matters and investigations. He represents clients before the SEC, various U.S. Attorneys Offices, the Texas Attorney General, local district attorneys offices, and numerous other federal, state, and local governmental authorities. Almost immediately after returning to private practice, he was selected as a Texas Super Lawyer in the area of white collar criminal defense, and has been included every year since 2006. D Magazine selected Mr. Mateja as one of the "Best Lawyers in Dallas" for 2008, 2009, 2011 and 2014. He was also selected by his peers for inclusion in the 2010-2016 editions of The Best Lawyers in America® in the practice areas of commercial litigation and SEC/telecom/energy regulatory defense.

As Senior Counsel to the Deputy Attorney General in 2003 and 2004, Mr. Mateja supervised the Justice Departments efforts in a number of high-profile corporate fraud prosecutions, such as Enron, World Com, Health South, Homestore.Com, Computer Associates, Credit Lyonnais, McKesson HBOC, Reliant Corporation, Symbol Technologies, Adelphia, and Rite Aid. Cataloguing these efforts is the Corporate Fraud Task Forces First and Second Year Reports to the President, which Mr. Mateja personally authored as the Task Forces point person.

As DOJs Special Counsel for Health Care Fraud in 2004, Mr. Mateja oversaw the Justice Departments civil and criminal health care fraud efforts. As a result of his efforts, the Justice Department reaffirmed health care fraud as a top white collar crime priority and instituted a number of high-profile health care fraud prosecutions, particularly in the area of pharmaceuticals. One such prosecution resulted in what was then the second largest criminal fine in a health care fraud case ($240 million), and the conviction of Warner-Lamberts Parke-Davis pharmaceutical division in connection with its illegal promotion of off-label uses for Neurontin, an anti-seizure drug. Another prosecution resulted in the conviction of Schering Sales Corp., the sales and marketing subsidiary of drug manufacturer Schering-Plough Corporation, and payment by Schering-Plough of over $340 million in criminal and civil fines. This prosecution centered on Scherings fraudulent pricing of Claritin, its blockbuster allergy medication.

In 2003, Mr. Mateja supervised DOJs violent crime efforts, which included oversight over the Bureau of Alcohol, Tobacco and Firearms and Project Safe Neighborhoods, President George W. Bushs comprehensive, strategic approach to reducing gun crime in America.

Mr. Mateja served as an Assistant U.S. Attorney in the Northern District of Texas beginning in 1991. As a federal prosecutor, Mr. Mateja prosecuted and tried to jury many of the most significant white collar crime and corruption cases arising out of the Northern District. Mr. Mateja received the 2001 Executive Office of U.S. Attorneys Directors Award for Superior Performance as an Assistant U.S. Attorney. He also received a number of other awards for outstanding work as a federal prosecutor from various federal and state law enforcement agencies, including the prestigious Texas Department of Public Safetys Directors Award.


J.D., Texas Tech University School of Law 1986
Associate Editor, Texas Tech Law Review
Order of Barristers

B.S., University of Notre Dame 1983


  • Texas 1986
  • Supreme Court of the United States
  • U.S. District Court for the Eastern District of Texas
  • U.S. District Court for the Northern District of Texas
  • U.S. District Court for the Southern District of Texas
  • U.S. District Court for the Western District of Texas

Memberships & Affiliations

​Mr. Mateja is a member of The National Trial Lawyers: Top 100 Trial Lawyers, which is an invitation only organization composed of premier trial lawyers across the United States.

Mr. Mateja serves on the ABA Criminal Justice Sections Upjohn Warnings Task Force, which has released its report entitled: "Upjohn Warnings: Recommended Best Practices When Corporate Counsel Interacts with Corporate Employees."

Mr. Mateja was elected Secretary-Treasurer of the Dallas Bar Association for 2009. Elected by statewide vote, Mr. Mateja served as President of the Texas Young Lawyers Association (TYLA), the public service arm of the State Bar of Texas, from 1997-1998. TYLA received the 1998 Presidents Service Award from then President Clinton for its work with at-risk youth. TYLA was also recognized during his presidency as the No. 1 young lawyers association amongst all large states by the ABA Young Lawyers Division.

From 1996-1999, Mr. Mateja served on the State Bar of Texas Board of Directors and its governing Executive Committee. He is a former trustee of the Texas Bar Foundation.

Mr. Mateja currently serves on the State Bars Texas Disciplinary Rules of Professional Conduct Committee which has been charged with revising the Disciplinary Rules in the wake of the ABAs Ethics 2000 model rule changes. He serves as an officer or member of numerous other bar committees including serving as Co-Chair of the Dallas Bar Associations Bench-Bar Committee and Vice-Chair of its Trial Skills Committee.

Mr. Mateja is the North Texas/Oklahoma Regional Co-Chair for the ABAs White Collar Crime Committee and a Co-Chair of the White Collar Section of the National Association of Criminal Defense Attorneys.

Other Distinctions

Media Coverage

Quoted, "Legal Experts: Ken Paxton Case Will Go to Trial," The Texas Lawbook ​(August 10, 2015). 

Quoted, “Ken Paxton Case Hinges on Betrayal of Trust,” Austin American-Statesman (August 5, 2015).

Quoted, “Lawyer Questions Paxton’s Felony Indictments,” Texas Lawyer (August 3, 2015).

Quoted, "Austin-based company sues U.S. State Department over 3-D printer guns," Austin American-Statesman (May 8, 2015).

Mentioned, "Feds Said to Be Stifling Gun Advocates Speech," Courthouse News Services (May 8, 2015).

Quoted, "Perry Claims Indictment Violates Constitution," Texas Lawyer (August 25, 2014).

Quoted, "A Week After Perrys Indictment, Legal Case Begins," The Texas Tribune (August 22, 2014).

Bill has been featured in Texas Super Lawyers – which salutes the top 5 percent of all attorneys in Texas – every year since 2006. D Magazine has named Bill among Dallas Best Lawyers in 2008, 2009, 2011, 2012, 2013, 2014, and 2015 for his work in white-collar defense. Since 2010, Bill has been selected to Best Lawyers in America for his work on behalf of clients in commercial litigation and SEC/telecom/energy regulatory defense. Lawdragon has named Bill one of the 500 Leading Lawyers in America.

Super Lawyers:
Texas Super Lawyers (2013-2006)

D Magazine:
Best Lawyers in Dallas: Criminal Defense, White Collar Defense-Antitrust (2015-2011, 2009-2008)
Top Personal Lawyers in Dallas (2009)

Best Lawyers in America:
2014-2012 Best Lawyers in America: Litigation – Regulatory Enforcement (SEC, Telecom, Energy); Litigation – Securities
2011-2010 Best Lawyers in America: Commercial Litigation
Texas Monthly:
Top Attorneys in Texas (2013-2007)
Top Texas Lawyers (2006)
Americas Most Honored Professionals:
Top 10% (2012-2011)
Lawdragon 500 Leading Lawyers in America

Teaching and speeches
From 1995 – 2002 and 2006 to the present, Mr. Mateja has served as an Adjunct Professor of Law at the Texas Tech University School of Law, where he teaches white collar criminal law, criminal pretrial litigation, civil pretrial litigation, and trial advocacy.

Mr. Mateja is a prolific speaker (see his recent speeches by clicking here), having spoken nationally to a number of organizations and groups, such as the American Bar Association (National White Collar Crime, Securities Fraud, and Health Care Fraud Institutes), Washington Legal Foundation, U.S. Chamber of Commerce, Federalist Society, Texas Association of Defense Counsel, National Association of Criminal Defense Attorneys, Corporate Counsel Forum, and State Bar of Texas, on a broad range of topics, including corporate fraud, health care fraud, securities fraud, the Foreign Corrupt Practices Act, accountant liability, sentencing of white collar defendants, Sarbanes-Oxley, corporate criminal liability, corporate compliance, parallel proceedings, deferred prosecution agreements, corporate prosecution guidelines, Justice Department sentencing policies, and the growing criminalization of civil practice.

Previously, Mr. Mateja was a frequent lecturer and instructor at the Justice Departments national training center in Columbia, South Carolina, speaking on topics such as Beginning and Advanced Conspiracy Law, Beginning and Advanced Corporate Criminal Liability, Corporate Fraud, Sarbanes-Oxley, the Federal Corporate Prosecution Guidelines, Proving Intent in White Collar Crime Cases, and Basic White Collar Crime.

For a comprehensive list of Mr. Matejas speaking engagements, please click here.

What Civil Lawyers Need to Know about Criminal Law, Dallas Bar Association Trial Skills Section (November 17, 2015).​

Criminal and Regulatory Issues and Trends Facing Drug and Medical Devices Industries: GMP Violations to Anti-Corruption Enforcement​, with Gus Coldebella and Tom Frongillo, Fish & Richardson Life Sciences IP Summit (November 5, 2015). 

Professionalism in the Law, Texas Tech Law Review Banquet (April 24, 2015)

Criminal and Regulatory Issues and Trends Facing Drug and Medical Devices Industries: GMP Violations to Anti-Corruption Enforcement, with Tom Frongillo and Seth Rodner, Fish & Richardson Life Sciences IP Summit (February 26, 2015).

Responding to Trade Secrets Theft (and How to Guard Against It): Perspectives of Former Federal Prosecuters,with Tom Frongillo, a Fish INSIGHTS webinar (February 19, 2014).

Around the World in 60 Minutes: A Global Update on Recent Anticorruption Enforcement Efforts, with Tom Frongillo, a Fish INSIGHTS webinar (January 2014).


Mr. Mateja is a regular contributor to Fishs Litigation Blog and his posts can be read here.

Texas Tech Law Review Fifth Circuit Survey: Criminal Procedure, Volume 47/Issue Book 3.

"Take 5- What Lawyers Need to Know About the Privilege Against Self Incrimination," Headnotes (May 2015).

"CMS Delays Finalizing Proposed ACA Overpayment Rule for Another Year," Fish Litigation Blog (February 17, 2015).

"Prosecutors Rarely Charge Banks Since Result Can Be Fatal," Bloomberg (April 30, 2014).

"Q&A with Bill Mateja," Law360 (March, 2013).

"The Fine Art of Making A Criminal Referral," Headnotes (October 2012).

"Corporate Counsel in DOJs Crosshairs," Headnotes (March, 2011).

Special Advertising Supplement, Texas Lawyer Roundtable Series, International Law, Vol. 24, No. 41 (January 26, 2009).

"Off the Record," with J. Masur, Los Angeles Daily Journal (December 4, 2008).

"Justice Department Report Shows Increased Enforcement of Export Controls," Fish & Richardson Export Control and White Collar Litigation Bulletin (November 25, 2008).

"New Federal Rule of Evidence 502 Limits Inadvertent Waiver Also Limits Subject Matter Waiver; Important to Regulatory Investigations," Fish & Richardson Litigation Alert (October 15, 2008).

"Scrutiny Increases Payment to Foreign Officials," Dallas Bar Association (May 1, 2008).

"What Civil Lawyers Need to Know About Criminal Law," Dallas Bar Association (May 1, 2007).

"Backdating Stock Options: In the Money And Under Investigation – What the Government Is Doing and What You Should Do in Response," with L. B. Willis, Esq., in "Securities Litigation & Regulation," Andrews Litigation Reporter, 12, 9, 1-6, (September 6, 2006).

"Attorney-Client Privilege Waivers in Criminal Investigations." This National Press Club panel presentation with Theodore Olson, George Terwillinger, and Mary Beth Buchanan was published in the Federalist Societys Engage (January 12, 2006).

"Andersen: Another View — No Barrier to DOJ," National Law Journal (June 13, 2005).

"Booker and FanFan: Congress Must Act," National Law Journal (January 31, 2005).

"Sentencing Reform, The Federal Criminal Justice System, and Judicial and Prosecutorial Discretion," Notre Dame J.L. Ethics & Pub. Poly, 18, 319 (2004).


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