Jon Feldhammer is the Partner-in-Charge of the firm’s San Francisco office and a former senior IRS trial attorney who now represents clients in high-stakes tax disputes. Most of his toughest cases are resolved quietly—often before litigation—so you won’t read about them. That is by design.

Jon understands how the IRS actually works—its priorities, pressure points, and decision-making process. He uses that insight to deescalate disputes, negotiate favorable resolutions, and, where appropriate, push the government to walk away. IRS personnel know him as both highly knowledgeable and a formidable advocate across every stage of a tax controversy, including examination, appeals, and litigation.

He has helped to resolve hundreds of complex matters involving the IRS, the California Franchise Tax Board, and other state agencies. His practice spans income tax, estate and gift tax, employment tax, and international tax issues.

Jon represents both individuals and public companies. Clients benefit from a hands-on, highly responsive approach combined with sophisticated technical judgment. He advises clients both proactively—helping them navigate new rules and correct past positions—and defensively, when disputes arise.

When necessary, Jon litigates in the U.S. Tax Court, U.S. District Court, and California Superior Court. But his focus is always the same: resolve the issue efficiently, protect the client’s interests, and avoid unnecessary exposure.