Thornhill, Mark

  Kansas City, Missouri, USA
 +1 816 474 8100
 +1 816 474 3216
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Mark Thornhill is a litigation partner with Spencer Fane. His practice concentrates on commercial, white collar criminal and constitutional cases. Mark has served as Chair of the firm’s Litigation Section. Prior to joining Spencer Fane, Mark served as a trial attorney with the United States Department of Justice, Tax Division-Criminal Section, in Washington, D.C.

Mark is active in civic affairs in Kansas City. He served as Chair of the Board of Directors of Truman Medical Center, Kansas City’s academic hospital. Mark also was President of the Board of the Kansas City Free Health Clinic and served on the Boards of the AIDS Service Foundation and Family Health Partners Insurance Company.
Commercial Cases
Mark has tried a wide variety of commercial cases. In fraud trials, Mark has represented business executives, bankers and lawyers. In the area of intellectual property, Mark has tried trademark and trade secrets cases. Mark represents corporations, their executive officers and directors in securities and derivative litigation. In bankruptcy litigation, Mark has tried insurance, financing and auction issues. In the area of environmental law, Mark's broad experience includes CERCLA cases, insurance coverage cases and the defense of enforcement actions.
White Collar Criminal Cases
Mark represents individuals and organizations in white collar criminal cases and investigations. Mark's white collar criminal defense work has involved tax crimes, health care fraud, bank fraud, mail and wire fraud, ERISA fraud and environmental crimes, particularly under the Clean Water Act and Clean Air Act. Mark's criminal defense clients have included Fortune 500 corporations, business executives and lawyers. Mark has served as the Chair of the Environmental Crimes and Enforcement Committee of the American Bar Association's Section on Environment, Energy and Resources Law.
Constitutional Law
Mark represented the Kansas City School District for five years in its landmark desegregation lawsuit. In that case, Mark obtained court victories that secured critical state funding for the School District and moved the School District toward independence from the federal courts. Mark also represented a large group of Missouri school districts in an unparalleled case that abolished a discriminatory state education-funding plan. Mark represented Missouri lawyers and physicians in appellate courts in the famous "right-to-die" case, Cruzan v. Missouri Dept. of Mental Health.


  • Prosecutor's Use of the Crime or Fraud Exception
  • Federal Prosecutions of Illegal Gratuties
  • Responding to a Search Warrant
Professional Associations and Memberships
  • American Bar Association

Practice Area
Commercial White Collar Criminal Constitutional