William J. Hartman

William J. Hartman is a retired American lieutenant general who served as the acting commander of United States Cyber Command, director of the National Security Agency and chief of the Central Security Service from 3 April 2025 to 16 March 2026, and as the deputy commander of the United States Cyber Command from 16 January 2024 to 16 March 2026. He previously served as the commander of the Cyber National Mission Force from August 2019 to January 2024.

Hartman was commissioned in the United States Army through the Army Reserve Officers' Training Corps at University of South Alabama, where he graduated.

In May 2023, Hartman was nominated for promotion to lieutenant general with assignment as the deputy commander of United States Cyber Command.

On 3 April 2025, Timothy D. Haugh, the director of the National Security Agency (NSA), was removed from his position. Hartman was named as acting director. On 4 September, Politico reported that president Donald Trump was expected to name Hartman as the commander of Cyber Command and the director of the NSA but was passed over. On 10 March 2026, Joshua Rudd was confirmed by the Senate to lead Cyber Command and the NSA.