Arthur D. Gregg

P 314.333.3914 | F 314.862.4656


Arthur Gregg helps clients navigate the complexity and uncertainty of litigation. Whether counseling an established corporation or an individual stepping into a courtroom for the very first time, Arthur works with his clients to make sure they are fully informed and best-positioned to obtain a victory at trial.

Arthur has successfully tried cases to judges, juries, and arbitration panels. He has also successfully defended his clients’ victories on appeal. Recognizing that sometimes the most beneficial outcomes occur before the onset of litigation, Arthur also works with his clients to recognize, preempt and resolve issues that can threaten his clients’ success and even livelihood.

Arthur has experience prosecuting and defending numerous types of claims on behalf of his clients, including breach of contract, negligence, fraud, tortious interference, negligent misrepresentation, trespass, abuse of process, and violations of the Missouri Merchandising Practices Act (MMPA) and the Illinois Consumer Fraud and Deceptive Business Practices Act (IFCA). Arthur has also developed a robust practice representing officers, directors, and shareholders of corporations, in both derivative and direct actions, within the context of “corporate divorces” and other management disputes. On behalf of these corporate clients, Arthur has successfully litigated claims for breach of fiduciary duty, shareholder oppression, injunctive relief, corporate receivership, corporate dissolution, breach of restrictive covenants, and violations of the Lanham Act, the Defend Trade Secrets Act (DTSA), the Missouri Uniform Trade Secret Act (MUTSA), and the Illinois Trade Secrets Act (ITSA).

Prior to joining Spencer Fane, Arthur worked as a judicial intern for the U.S. Court of Appeals for the Eighth Circuit and clerked for Sidley Austin’s Capital Litigation Project, the Equal Justice Initiative in Alabama, and a Portland-based law firm during its appeal of a capital conviction. While studying at Notre Dame Law School, Arthur also earned a Master’s degree in English from Notre Dame’s College of Arts and Letters and served as the Executive Notes Editor for the Notre Dame Journal of Law, Ethics & Public Policy.

Arthur has been involved in numerous charitable and civic organizations. Arthur serves as Vice-Chair for the Civil Practice and Procedures Committee of the Missouri Bar. Arthur has also donated his time and skills to the Wills for Heroes Foundation, which prepares wills, powers of attorney, and trust documents to emergency first responders. Arthur also returns to the University of Notre Dame twice a year to serve as a guest faculty instructor for the law school’s Intensive Trial Advocacy Program and to work with the next generation of trial attorneys.



  • University of Notre Dame Law School (J.D.), cum laude, Thomas J. White Scholar
  • University of Notre Dame (M.A.)
  • Truman State University (B.A., B.S.), summa cum laude, General Honors

Bar Admissions

  • Missouri, 2014
  • Illinois, 2015

Court Admissions

  • U.S. District Court for the Eastern District of Missouri
  • U.S. District Court for the Western District of Missouri
  • U.S. District Court for the Southern District of Illinois
  • U.S. Court of Appeals for the Eighth Circuit
  • U.S. Court of Appeals for the Seventh Circuit

  • Best Lawyers in America, Ones to Watch, Commercial Litigation, 2021-2024
  • Missouri & Kansas Super Lawyers, Rising Stars, 2022-2023