John Duffey is a member of Maslon's Litigation Group and practices in the area of business litigation. His experience includes representing companies in non-compete, trade secret, business torts, and contract litigation.

John earned his bachelor's degree in history from Duke University in Durham, North Carolina. He earned his law degree, cum laude, from the University of Michigan Law School in Ann Arbor, Michigan. During law school, he served as editor-in chief of the University of Michigan Journal of Law Reform and was the recipient of the Jeffrey S. Lehman Legal Practice Award and the Sarah Honigman Memorial Award.

Selected Experience

  • Co-counsel for ten-day arbitration hearing in corporate breach of contract dispute.
  • Represented corporate client defending breach of contract and breach of fiduciary duty claims in multiple states.
  • Won preliminary injunction against two former employees of medical device manufacturer for violating non-compete and confidentiality provisions of their employment agreements.

Professional Activities

Minnesota State Bar Association
Hennepin County Bar Association


p 612.672.8356   f 612.642.8356
3300 Wells Fargo Center, 90 South Seventh Street
Minneapolis, MN 55402
Areas Of Practice
Bar Admissions
Minnesota, 2011
U.S. District Court
  • Minnesota, 2014
  • E.D. Michigan, 2013
University of Michigan Law School
J.D., cum laude, 2011
Duke University
B.A., 2006
Major: History
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