David B. Tulchin

Note: Public records indicate that the prominent litigator David B. Tulchin of Sullivan & Cromwell passed away prior to the date of this summary. The single tracked case appearance as "of counsel" with Jones Day for plaintiff Reynolds American Inc. is not reflected in his extensive public career history and is inconsistent with his long-established practice.

David B. Tulchin was a distinguished trial lawyer with a career spanning more than 40 years at Sullivan & Cromwell LLP, where he was a partner and later of counsel. His practice focused on high-stakes, complex commercial litigation, with a particular emphasis on antitrust law. His work also encompassed patent, trademark, contract, and securities matters. For over a decade, Mr. Tulchin was a lead national counsel for Microsoft, defending the company in dozens of private antitrust actions brought by consumers and competitors. He secured numerous dismissals and successfully argued appeals for Microsoft in multiple U.S. Courts of Appeal and state supreme courts.

Mr. Tulchin’s practice was characterized by the defense of major operating companies in complex disputes. Beyond his work for Microsoft, he achieved significant victories for clients such as Micro Systems Engineering, Inc. in a trade secret and copyright case that concluded with a judgment as a matter of law in his client's favor, which was affirmed on appeal. He was a seasoned courtroom advocate, having tried more than 30 business cases to verdict and argued dozens of appeals in state and federal courts. There is no public record of IPR or other PTAB proceedings in which he appeared.

A Fellow of the American College of Trial Lawyers, Mr. Tulchin was frequently recognized by legal publications for his litigation success. His entire documented career was with Sullivan & Cromwell. The appearance as "of counsel" at Jones Day noted in the provided case data is not corroborated by his firm biography or other public records and represents a significant departure from his well-established defense-oriented practice at Sullivan & Cromwell.

Mr. Tulchin earned his J.D. from Harvard Law School in 1973 and was admitted to the New York bar in 1974.