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

Dartmouth College, A.B., 2006

Columbia Law School, J.D., 2013

Judicial Clerkship

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

Kemper Diehl

Kemper Diehl represents plaintiffs and defendants in high-stakes commercial litigation nationwide. His recent cases include breach-of-contract, patent, trade secret, securities fraud, and environmental tort suits. 

Kemper 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, inventors, and entrepreneurs to Fortune 100 companies. In 2021, Best Lawyers in America named Kemper One to Watch, Commercial Litigation” (2021, Woodward White, Inc.).

Kemper was a James Kent Scholar at Columbia Law School. A New Jersey native, 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.

Before law school, Kemper built business and finance experience as a management consultant at Bain & Company and as an investment associate at the private equity firm Thomas H. Lee Partners. Kemper graduated cum laude from Dartmouth College in 2006, where he was captain of the men’s NCAA Division I swimming team.

Notable Representations
  • Represent private investor in shareholder fraud suit against public company NextGen Healthcare, after successfully winning appeal of an adverse ruling. Click here to read the appeal decision.
  • Represent major technology company in private arbitration defending against claims of alleged trade secret misappropriation and breach of contract.
  • Represent inventor of software technology in patent lawsuits against major smartphone companies, including Apple and Google.
  • Represented executives of successful social media start-up in breach of contract suit for executive compensation following company’s sale.
  • Obtained complete dismissal for investment bank Cantor Fitzgerald of securities fraud claims brought by class of shareholders. Read the court’s opinion here.
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