Kemper Diehl
Seattle Office Phone: (206) 373-7382 Email Download vCard Print Bio to PDF

Columbia Law School, J.D., 2013

Dartmouth College, A.B., 2006


Judicial Clerkship

Law Clerk to Judge William H. Walls, U.S. District Court, District of New Jersey

Kemper Diehl

Kemper Diehl is an accomplished trial lawyer who represents clients in complex business disputes and high-stakes litigation nationwide. His recent cases include patent, trade secret, securities fraud, breach-of-contract, and environmental tort suits.

Diehl has a track record of obtaining wins in trial and appellate courts, favorable settlements, and arbitration victories for his clients, who range from individual investors and entrepreneurs to Fortune 100 companies.

In 2021 and 2022, Best Lawyers in America named Diehl “One to Watch” with recognition for his accomplishments in both Commercial Litigation and Intellectual Property Litigation. Super Lawyers also recognized Diehl as a “Rising Star” in 2022.

Notable Representations
  • Certain Power Semiconductors, and Mobile Devices and Computers Containing Same (International Trade Commission) Representing the Complainant, Arigna Technology, in an International Trade Commission Investigation alleging that Apple and TCL infringe a semiconductor patent.
  • Expedia Group (AAA Arbitration) Defended Expedia in a multi-year breach-of-contract and trade secret misappropriation case. After extensive arbitration proceedings, the matter resolved successfully before trial.
  • Ahmed Hussein v. Quality Systems, Inc. (Cal. Superior Court and AAA Arbitration) Represented a major shareholder and former company director bringing securities fraud claims against a healthcare company. Diehl briefed a winning appeal before securing an $11 million recovery in arbitration.
  • Arendi S.A.R.L. v. Apple, Inc. (D. Del.) Represented Arendi in a patent infringement action against Apple related to smartphone software. Diehl took key depositions before obtaining a favorable outcome ahead of summary judgment.
  • Confidential Co-Founders v. Social Media Start-up (JAMS Arbitration) Advocated for co-founders of high-growth social media start-up to obtain payouts they had been wrongly deprived when a new investor acquired the company.

Diehl graduated from Columbia Law School in 2013, where he was a James Kent Scholar (top 10% of class). He clerked for Judge William H. Walls on the U.S. District Court for the District of New Jersey and practiced law at Covington & Burling before joining Susman Godfrey.

Diehl’s litigation practice and strategic advice leverage business and finance experience he built earlier in his career. Previously a management consultant at Bain & Company, Diehl developed strong industry experience in financial services by advising private equity, insurance, and consumer lending clients. After Bain, Diehl joined private equity firm Thomas H. Lee Partners, where he contributed to financial analysis underlying two >$1 billion portfolio company acquisitions.

Diehl graduated cum laude from Dartmouth College in 2006, where he was captain of the men’s NCAA Division I swimming team.

Honors and Distinctions
  • Rising Star,  Washington Super Lawyers (2022, Thomson Reuters)
  • One to Watch – Commercial Litigation, Intellectual Property Litigation, Best Lawyers in America (2022, 2023, Woodward White Inc.)
  • James Kent Scholar at Columbia Law School (~Top 10% of Class)
  • Columbia Human Rights Law Review Member and Articles Editor for the Jailhouse Lawyer’s Manual
  • Clarkson S. Fisher Historical Society Essay Award recipient
  • Advocacy as law student for Bronx resident featured in The New York Times
  • Captain, Dartmouth Swimming (NCAA Division I) and former school record holder
  • William Jewett Tucker Foundation Fellow, Dartmouth College