John Mansfield, Attorney

"Great ideas make great companies."
John Mansfield

John represents large and small businesses in complex litigation throughout the country, especially patent, copyright, and trademark disputes, and cases involving cannabis. John also advises on IP and FDA issues.

John’s careful research, clear communication, and forceful execution help his clients avoid litigation when possible and prevail when necessary. John’s intellectual property matters typically involve representing clients involved with high tech, hardware, software, consumer products, e-commerce, or cannabis.

John is also a certified mediator, specializing in mediating intellectual property and cannabis disputes.

John has been named an Oregon Super Lawyer in IP litigation every year since 2009, and he was selected as one of the top 1000 patent professionals worldwide by Intellectual Asset Management magazine. He is also an adjunct patent litigation professor at Lewis & Clark Law School.

A native Oregonian, John graduated from Cornell Law School magna cum laude and Order of the Coif, serving as the Articles Editor of the Cornell Law Review. Before joining Harris Bricken, John practiced at Morrison & Foerster in San Francisco, at Covington & Burling in Washington, D.C., and as an IP litigation partner at Schwabe, Williamson & Wyatt in Portland.

John’s professional service includes terms as the past president of the Oregon Patent Law Association and the Federal Bar Association, and as a member of the Oregon State Bar Board of Governors. He has also served on the boards of All Classical Radio (chair) and Portland Piano International. He is currently a board member with Hollywood Theatre. When John isn’t spending time with his two boys, you can find him at a musical performance, either onstage behind the keys or in the audience.

More About John

Professional Experience

Intellectual Property Partner, Schwabe, Williamson & Wyatt, Portland OR

Senior Litigation Associate, Morrison & Foerster, San Francisco CA

Regulatory and Litigation Associate, Covington & Burling, Washington DC

Judicial Clerk, Honorable Conrad K. Cyr, United States Court of Appeals for the First Circuit

Volunteer Activities

Oregon Cannabis Association: 2017-present

Open Cannabis Project: 2017-present

Hollywood Theatre:  Board Member (2017-present)

Oregon Volunteer Lawyers for the Arts:  2017-present

Portland Piano International: Board member (2013-16)

All Classical Portland, KQAC 89.9: Board chair (2008-13)


Oregon Patent Law Association: Former President

Oregon Federal Bar Association: Former President

Former Ninth Circuit Lawyer’s Representative: U. S. District Court,
District of Oregon

District of Oregon Local Rules Advisory Committee: Former Member

Lewis & Clark Law School: Adjunct Professor of Law, patent litigation

Oregon State Bar Board of Governors: Former Member


Oregon SuperLawyers: Selected by peers as SuperLawyer in IP Litigation every year since 2009, reserved for top 5% of Oregon lawyers.

IAM 1000 for 2013: Ranked as one of the top 1000 patent professionals world-wide by Intellectual Asset Management magazine, which described him as “a very bright guy [,] aggressive and successful.”

Martindale-Hubbell AV ranking: Awarded preeminent ranking (5.0 out of 5) by peers for legal ability and ethics.


  • Cornell Law School (J.D., magna cum laude, Order of the Coif, 1993)
  • Portland State University (M.S., 1990)
  • University of Oregon (Bachelor of Music, 1985)

Bar & Court Admissions

  • Oregon
  • Washington
  • California
  • District of Columbia
  • United States District Court for Oregon, N.D. California, W.D. Washington, E.D. Washington, E.D. Michigan, E.D. Wisconsin, and District of Columbia
  • Court of Appeals for the Ninth Circuit and the Federal Circuit
  • United States Supreme Court