Kemper Diehl is an accomplished trial lawyer and trusted advisor in complex business and financial disputes. His experience covers a wide range of cases, including breach of contract, securities fraud, breach of fiduciary duty, patent infringement, antitrust, trade secret, and mass tort litigation.
Diehl is a stand-up advocate with experience representing clients before state and federal courts across the country, most often appearing in California, Texas, New York, and Delaware. His clients range from Fortune 100 companies in high-stakes lawsuits to individual investors and entrepreneurs who need a strategist and advocate to pursue their interests against formidable adversaries
Lawdragon Honors
| Honor | Year | Practice |
|---|---|---|
| The 2026 Lawdragon 500 X – The Next Generation | 2026 | Commercial Litigation, esp. Financial |
| The 2025 Lawdragon 500 X – The Next Generation | 2025 | Commercial Litigation, esp. Financial |
| The 2024 Lawdragon 500 X – The Next Generation | 2024 | Commercial Litigation, esp. Financial |
| Lawdragon 500 X – The Next Generation | 2023 | Commercial Litigation, esp. Financial |
NOTABLE REPRESENTATIONS
- Shafi v. SoftBank – Representing Abraham Shafi, co-founder of tech unicorn IRL, in litigation against SoftBank in California and Delaware courts arising from the company’s shutdown in 2023.
- Porch Group v. Gallagher Re and China Construction Bank –Representing Porch Group in Texas and New York litigation against Gallagher Re and China Construction Bank arising from defective reinsurance.
- Hussein v. NextGen Healthcare – Represented Ahmed Hussein, a major shareholder and former director of NextGen Healthcare, in securities fraud and indemnification claims against the company. Diehl briefed a winning appeal before securing an $11 million recovery in arbitration.
- Expedia – Defended Expedia in a multi-year breach-of-contract and trade secret misappropriation case. After extensive arbitration proceedings, the matter resolved successfully before trial.
- Arendi v. Apple, Google – Representing patent-owner Arendi in patent infringement actions against Apple, Google, and other tech companies related to smartphone software.
- Arigna v. Apple, Google – Represented semiconductor patent-owner Arigna Technology on infringement claims against Apple, Google, and other tech companies before the International Trade Commission and federal courts.
- Start-Up Co-Founders – Represented co-founders of high-growth social media start-up to obtain payouts they were deprived when a new investor acquired the company.