Hann started her career with
NOAA as a fisheries observer in 1996 and she commissioned as an officer in the NOAA Corps in 1999. She served on commercial fishing vessels,
NSF research vessels and various
NOAA ships and aircraft, as a pilot, flight meteorologist, NOAA Diver and unmanned aircraft systems pilot. She is responsible for the direct leadership and management of OMAO's operational assets, including the agency's fleet of 16 research and survey vessels and nine aircraft. Prior Assignments: • Commanding officer of the NOAA Aircraft Operations Center • Office of Marine and Aviation Operations Chief of Staff. • Executive Officer at the NOAA Marine Operations Center-Atlantic • Associate Director at the Atlantic Oceanographic and Meteorological Laboratory • NOAA liaison to the
U.S. Pacific Command. In June 2024, RADM Hann was appointed for promotion to vice admiral and appointment as NOAA's deputy under secretary for operations. She assumed office and rank, effective 15 July 2024. On January 20, 2025, Hann became Acting Under Secretary of Commerce for Oceans and Atmosphere as well as NOAA Administrator. In November 2025,
Politico announced that she will retire from the NOAA Corps effective 1 March 2026 after over 27 years of service. Hann had been on terminal leave from 22 December 2025 up until her effective retirement date. ==Education==