About Donald Osborn
Donald Osborn Chesworth is a partner at Tully Rinckey PLLC, located at 400 Linden Oaks Suite 110 in Rochester, New York. He joined the New York State Bar in 1972, starting a distinguished legal career that spans over five decades. The firm specializes in various areas of law, including business law, criminal law, real estate law, municipal liability, and civil litigation, providing a comprehensive range of legal services to its clients. Chesworth earned his Juris Doctor (J.D.) from Yale Law School in 1966, a prestigious institution known for producing influential legal professionals. Prior to his legal education, he received a Bachelor of Arts degree in Business Administration, graduating magna cum laude from Graceland College in 1963.
This strong academic foundation laid the groundwork for his future endeavors in both law and business. After completing his law degree, Chesworth began his career as an FBI agent, where he worked in federal law enforcement. In 1972, he transitioned into private practice, joining Goldstein, Goldman, Kessler & Underberg, which is now known as Underberg & Kessler. His practice areas have expanded over the years to include governmental compliance, business law, municipal liability, commercial law, employment law, and management issues, demonstrating his versatility and expertise in the legal field. Chesworth is admitted to practice in several esteemed courts, including the U.S.
District Court for the Western District of New York, the U.S. Court of Appeals for the Second Circuit. The U.S. Supreme Court. Before joining Tully Rinckey in 2018, he served as the managing partner at Harris, Chesworth, Johnstone & Welch, LLP, where he developed his leadership skills and legal acumen.
His experience also includes serving as the District Attorney of Monroe County and as Superintendent of the New York State Police, roles that provided him with unique insights into both criminal and civil law. In addition to his legal practice, Chesworth is an active member of the Monroe County Bar Association and the New York State Bar Association. His contributions to the legal community have been recognized, and in 2025, he received a Lifetime Achievement Award from the New York Legal Awards. This accolade supports his excellence in the legal profession and his enduring impact on the community he serves. With a rich background and a dedication to justice, Donald Osborn Chesworth continues to be a prominent figure in New York's legal field.
